Why Does Light Exist? What is Its Purpose?

Рет қаралды 601,190

Күн бұрын

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REFERENCE VIDEOS:
Special Relativity: • Special Relativity sim...
How all the fundamental forces work: • Why & How do the 4 fun...
Quantum Electrodynamics: • How QED Unites Relativ...
CHAPTERS:
0:00 We can't see matter
1:15 Is Light a wave or a particle?
4:01 How speed of light led to Relativity
5:05 How light is involved in energy transfer
7:10 How light is involved in forces
8:56 Can a universe exist without light?
9:36 What is the purpose of light?
13:03 20% discount on BespokePost
SUMMARY:
What is the purpose of light? How does light work? Why does Light exist? There had been a controversy about whether light was particles or waves. Albert Einstein showed that light must come in discrete packets of energy which today we call photons, because that’s the only way to explain the photoelectric effect.
Light has characteristics of both waves and particles, but it is neither. It's a quantum object which obeys the Schrodinger equation, which has a wave function in it. This function shows that quantum objects and their quantum states such as position, momentum, spin etc. are in flux, similar to the way that the amplitude of a classical wave is in flux. So, if anything, a photon is a wave of probability, the probability of finding it at any particular location if we look there.
But about 50 years before quantum mechanics, James Clerk Maxwell came up with his laws of electromagnetism, which revealed that light was an electromagnetic wave. And that its speed could be determined precisely by two constants which are part of electromagnetic theory - the dielectric constant and magnetic constant, or the permittivity and permeability of free space. This fact that the speed of light is determined by the innate property of empty space led Albert Einstein to hypothesize that the speed of light in space is the same for every reference frame. And this led to the theory of Relativity. So light played an important role in development of both quantum mechanics and Relativity - which together is the best understanding we have today of how the universe works.
But light is an essential currency that our universe uses to transfer energy from one thing to another. For example, the sun shines because in its core, Hydrogen atoms combine to form a helium nucleus through fusion. Much of this energy released is in the form of gamma rays, which are high energy photons.
Almost all the artificial light created on earth is the result of electrons collapsing to lower orbits in an atom, after they have been excited by some source of energy into a higher energy state.
Light is also important for what we can feel. Quantum Electrodynamics developed in the 1940s by Richard Feynman and others, revealed that the electromagnetic force is mediated by photons. So a significant number of forces you feel would not be possible without photons.
Without light, you wouldn’t feel anything, because touch is a result of electromagnetic interactions between your skin and the surface you are touching. And since the atoms in your body are held together due to the electromagnetic interactions between the positively charged nucleus and negatively charged electrons, atoms would not exist without light either.
No light means no atoms, no cars, no houses, no you and me. and no universe as we know it. Sound could still exist, but you wouldn’t be there to hear it.
But the universe could still exist if we took away electromagnetic force, but it would not resemble the universe we know. We would still have gravity, the strong force and the weak force, so we could still form nuclei and have certain nuclear decays. Very large nuclei could probably form in such a universe since there would be no electrostatic repulsion between protons preventing very large nuclei from forming.
Other than the universe looking the way it does today, light plays a vital role in almost all processes where energy is exchanged. Whenever, energy is either expended or absorbed, photons are almost always involved. From chemical reactions, to thermal radiation, to friction, even to many nuclear processes, photons are involved.
#photons
#light
The speed of light is present in Einstein’s mass/energy equivalence equation E=mc^2. What this means is that if all the mass of an object were converted to energy, it would be in the form of photons traveling at the speed of light. Photons would be the objects carrying this energy of what had been the mass.
Every object in the universe radiates photons. This is called black body radiation. And it’s a property of any object above absolute zero. In the process of energy exchange via photons, information is also exchanged. Light is the fundamental currency used to exchange energy and information from one part of the universe to another.

Пікірлер: 2 100

@ArvinAsh Жыл бұрын

Guys, I'm really excited about our sponsor for this video. The products I receive are superb! Check them out, and you will be helping our channel if you decide to subscribe. Many thanks for that! Head to www.bespokepost.com/arvinash20 and use code ARVINASH20 to grab your “box of awesome” and get 20% off your first box.

@shethtejas104 Жыл бұрын

Arvin, marvellous effort this. I must compliment you for the choice of visuals in particular. It must take huge efforts to compile all the visuals and also a lot of creative thinking. Kudos to your hard work. May I make some requests for the next video of yours? Please allow me. (1) Northern lights. I saw them recently. I am still in complete awe of its beauty. Yes, there is google. But google is not Arvin! And the way the two explain things is totally different. (2) Shannon's paper on information theory. I am a telecom engineer, I write microprocessor code for global telecom chip makers. I know that Shannon's equation C=B(log-base-2-of-SNR + 1) has done to the world of telephony, what Einstein did to classical and quantum mechanics. But Shannon, my hero, has not got the kind of limelight he deserves. Could you spell out Shannon's work for the masses please? I will make more requests in future. Thank you once again!

@sirdiealot53 Жыл бұрын

Thank you for correctly pronouncing “processes”! Sooo many videos say it like “process-EEZ” which is wrong and sounds pretentious.

@famgod8318 Жыл бұрын

I know this sponsorship is mainly aimed at your US audience but as a Brit I couldn’t help but chuckle when they were described as ‘top shelf’ Clearly has a very different meaning across the pond.

@ujjwalverma468 Жыл бұрын

Thank you

@81giorikas Жыл бұрын

Einstein died admiting he doesn't really know what photons are and youtube is full of videos claiming to do so. Well.

@TheSaferHouse Жыл бұрын

A photon walks into a hotel. The bellhop says, "Excuse me sir, may I take your luggage?" The photon replies, "No thanks, I'm traveling light."

@mikeoglen6848 Жыл бұрын

I think you are stretching things a bit to imagine that Photons can actually talk...

@perrynn7173 Жыл бұрын

@@mikeoglen6848 It's just a joke. Goodness me.

@EinsteinKnowedIt Жыл бұрын

Holy magic schoolbus 😮

@nevamind68t23 Жыл бұрын

Ka-boom-boom 😂 👍🏾 🤎

@Archiveofobscurity Жыл бұрын

Loooooool 😹

@ViciousViscount Жыл бұрын

What's truly mind blowing about light is that a photon, due to relativistic effects (time dilation, length contraction) does not experience time nor space. From a photon's point of view the universe is just a single point, and everything happens all at once. It basically exists in a timeless spaceless form. Which is so crazy.

@TMoneyMil Жыл бұрын

Which means it could’ve existed BEFORE the universe was created. I think we are missing information about exactly what light is.

@nikhat6884 Жыл бұрын

@@TMoneyMil no it's just really simple, no need to make it complicated.

@DrDeuteron Жыл бұрын

there are no reference frames at the speed of light, so saying light doesn't experience time can be misleading.

@stylusapteryx1490 Жыл бұрын

@@DrDeuteronOr is it that light IS the reference frame, the universal constant? From outside, light can be observed travelling through space and time. But through relativity (being relative to the constant reference frame of light), space and time are contracted as you approach light speed, until at the speed of light distance and time are both zero. So light does not experience either time or distance.

@hyperduality2838 Жыл бұрын

SINE is dual to COSINE -- waves are dual, the word 'co' means mutual and implies duality. Bosons (waves) are dual to Fermions (particles) -- wave/particle or quantum duality. Time dilation is dual to length contraction -- Einstein, special relativity. At the velocity of light there is no distance or space! "Always two there are" -- Yoda.

@markmark63 Жыл бұрын

The behaviour of photons that blows my mind - given that they are packets of energy is that after radiating out in all directions from a distant star - for example V762 Cas in Cassiopeia, photons constantly arrive at my retina then stop. But if I then move 5mm to my left, right, forward, back, or move a mile or 1,000 miles I can still see it. It blows my mind that photons are still radiating to every microscopic point in the visible universe from 1,000's of light years away.

@resq5707 Жыл бұрын

Relative to each other each of us is at the centre of the universe, 13.8 billion light years pivoting on our heads 😮

@aprisonerscinemastephenmur6932 Жыл бұрын

You are brilliant mate! So many times i stumble across a new video at the right time and it just perfectly pieces together a deeper more intuitive grasp of different fields in physics and the natural of reality in general. Thank you!

@wesbaumguardner8829 Жыл бұрын

No, he is just good at duping people into believing nonsense.

@alcyone1349 Жыл бұрын

It seems that we all take light for granted a little too much. Wow! Thanks Arvin!

@hyperduality2838 Жыл бұрын

@edinfific2576 Жыл бұрын

@@hyperduality2838 If there is no distance or space for light, then it should get anywhere in no time. 😁

@hyperduality2838 Жыл бұрын

@@edinfific2576 Spooky action at a distance -- Einstein. Light does not experience time as space is contracted to zero in the direction of motion. Space is dual to time -- Einstein. Null vectors (light rays) are dual to spinors (matter). Spinors come in pairs -- Weyl spinors. Duality (thesis, anti-thesis) creates or synthesizes reality (non duality) -- the time independent Hegelian dialectic. Making predictions to track targets, goals & objectives is a syntropic process -- teleological. Teleological physics (syntropy) is dual to non teleological physics (entropy). "Always two there are" -- Yoda.

@TheTck90 Жыл бұрын

@@hyperduality2838 There is so much wrong with your babbling that I don't know where to start from...

@onlythewise1 Жыл бұрын

@@hyperduality2838 ya been known for fifty years

@shethtejas104 Жыл бұрын

Arvin, a great video once again. Please continue the good work and spreading the 'light' of knowledge :)

@e.mcguire1538 Жыл бұрын

Thanks so much, Arvin. Your programs are lucid and exciting. I wish videos like this had been available way back when I was in high school and college.

@ArvinAsh Жыл бұрын

You're very welcome! I wish that too, that's why I decided to create them.

@user-hh7wi3me3e 10 ай бұрын

Very cool videos Arvin! Thank you so much for the great and beautifully put explanation on almost every difficult science matter that you do a video on🎉

@binbots Жыл бұрын

General relativity and quantum mechanics will never be combined until we realize that they take place at different moments in time. Because causality has a speed limit (c) every point in space where you observe it from will be the closest to the present moment. When we look out into the universe, we see the past which is made of particles (GR). When we try to look at smaller and smaller sizes and distances, we are actually looking closer and closer to the present moment (QM). The wave property of particles appears when we start looking into the future of that particle. It is a probability wave because the future is probabilistic. Wave function collapse happens when we bring a particle into the present/past. GR is making measurements in the predictable past. QM is trying to make measurements of the probabilistic future.

@mclilzenthepoet2331 Жыл бұрын

Science solved

@akshaypratapsingh9706 Жыл бұрын

Have u written a paper yet? I am no expert but this sounds fascinating..... probably physicists could prove or disprove. I suggest you to go on and look for a physicists for a peer review. All the best.... you have got great skills👍

@xpg2124 Жыл бұрын

i mean all of that is entirely true but humans finding ways around seemingly impossible things, for a simplified example, calculus. humans thought infinity was impossible but all you have to do is look at it differently. i’m not saying your wrong but i’m also saying give humans more credit on finding really unorthodox ways around seemingly impossible problems

@lordgarion514 Жыл бұрын

You do realize that the wave function has NEVER been seen, or verified by any observations. It might be a real thing, and it just as likely might be something completely different.

@xpg2124 Жыл бұрын

@@lordgarion514 wave functions aren’t really real they’re just a mathematical construct of what’s really going on with the probability of a given particle

@chbrules Жыл бұрын

Every video, Arvin delivers. I'm a nerd for physics. Even when I think I know a lot about a specific topic, I always learn something new from Arvin!

@TheLoneMitten Жыл бұрын

Seriously. This sort of stuff is great conversation fodder too. Fun at parties.

@vm-bz1cd Жыл бұрын

Agree totally!

@shethtejas104 Жыл бұрын

@@TheLoneMitten Please tell me which parties you go to. The ones that I go to, nobody has any capacity to talk anything intellectual these days. LGBTQ is the new EMC squared of today :D

@hyperduality2838 Жыл бұрын

@TheLoneMitten Жыл бұрын

@@shethtejas104 not any good ones for the past 10 years but I'm hoping to find some new , interesting blood to hang out with. If you're in Massachusetts, let's hang out.

@garycross90 6 ай бұрын

Thank you Arvin. I was struggling to understand the application of electromagnetism until the moment you used friction as an example. I get it now and can now see all the applications for it everywhere. It's alive! And our life.

@colbynye5995 Жыл бұрын

This was a great topic! I've always wondered a photons purpose! I'd love to see a video on Purpose and Function of other Standard Model elementary particles like muon, tau particles. Thanks!

@Dogsnark Жыл бұрын

I’ve never heard light explained this way. I don’t fully understand this explanation, so I need to watch it again. But what a fascinating video.

@LazyRare Жыл бұрын

Good luck

@zodoturtle3779 Жыл бұрын

I will give you a boost. It feels to me that he is playing fast and loose with the definition of light. In is explanation and examples he is referring to all of the electromagnetic spectrum as light. This includes all radio waves including but not limited to AM/FM, TV Stations, WiFi, cell phone signals, Bluetooth, wireless charging and microwaves from ovens power. It also includes heat from a stove or bed warmer (Infrared).

@TheAncientAstronomer Жыл бұрын

@@zodoturtle3779And yet he is correct. Everything is light. And not just the tiny part,of the EM spectrum, we can see.

@alfadog67 Жыл бұрын

"Light is the fundamental currency used to exchange energy and information" - Professor Arvin Ash 🏅 Thank you for defining such a philosophical topic so literally! Professor Ash, I would appreciate your insight and lens regarding the animations of photons and electrons at 6:22 , but as quantum objects instead of classical ones.

@MitzvosGolem1 Жыл бұрын

Fiber optic internet telecom also . Banks use for transmission of currency 💲💵

@Chizzoide Жыл бұрын

@@MitzvosGolem1 money is a very specific currency for a very specific species at a very specific moment in time and place in the universe. While light is a universal currency.

@MitzvosGolem1 Жыл бұрын

@@Chizzoide electro magnetic money 🤑

@Chizzoide Жыл бұрын

@@MitzvosGolem1now I'm thinking of funnier things, like electromagnetic farts

@ShomeAvi Жыл бұрын

Light is God

@dukeon 9 ай бұрын

Great explanation of light (and electromagnetic radiation in general). I’m always on the lookout for good physics videos to point my friends - who are interested in physical science but don’t have university level education - and lately I’ve been recommending many of your videos. Thank you!

@ivanjelenic5627 Жыл бұрын

I love that you always say "almost all", many people skip that very important detail.

@Shaaan Жыл бұрын

Last time I was here you were on 90k, infact I was from start where you had 6k subs. You deserve it all.

@ChilledParadox Жыл бұрын

I believe physics channels grow slower as those interested are niche, and that niche group is very wary of pseudo-information channels, especially since the dislike button was removed. But once people establish that a channel is legitimate and the numbers pick up they grow exponentially as it’s like a giant glowing sign.

@stefaniasmanio5857 Жыл бұрын

OMG... this is amazing.. content, explanation, sequence.. really the best synthesis ever... thank you so much!

@ronjon7942 Жыл бұрын

I know I studied Maxwell in college, but it was beyond my comprehension. I still don't intuit it, but Arvin's mention at 4:15 of the permitivity and permissiveness of free space, and how those properties 'limit' the speed of light, FINALLY shed some realization on Einstein's thought experiment of the speed of light in a train equaling the speed of light on the ground. Of course there's still more I don't know than do (and for now, I don't have to worry about that), but now actually believing the speed of light is the same from every reference point opens up a lot of lay explanations and theories to me. I always got hung up on the speed of light thing so I could never really digest relativity, time paradox, black holes, time dilation and so on, so it will be exciting revisiting these topics with a different perspective. Granted, I'm basically switching from Einstein 'saying so' to Maxwell, but it's a start. It's not like I 'know' why electricity flows in a certain direction either, or how some matter vibrates at unbelievable frequencies, but I can accept the phenomenon; now I feel like I can accept that light travels at a particular speed, a pretty big deal. Too bad it's over 30 years late!! :) Thank you very much, Mr. Ash! Know that you helped this guy understand just a little bit more today.

@4apca Жыл бұрын

This is just excellent! Thank you Arvin !

@Hossak Жыл бұрын

This is the way light should be introduced at school. Great video Arvin!!!!

@osaobomhenefoghe8967 Жыл бұрын

I like seeing the physical universe through the equations... mind blowing!

@RogerMillerInVA Жыл бұрын

This is the simplest, clearest explanation of these phenomena - and in fact, of relativity and quantum theory generally - that I have ever heard. Thank you!

@ArvinAsh Жыл бұрын

Glad it was helpful!

@rubenpalma4045 Жыл бұрын

Once again, a great video from Arvin Ash. What about a video solely on INFORMATION and its relation to energy and matter? Kind regards... and thanks!

@ArvinAsh Жыл бұрын

This one I think is the video you may be look for that I made in the past: kzfaq.info/get/bejne/ipxzq7dlpqu3c4U.html

@iamstillthinking Жыл бұрын

Anytime I want to learn something amazing about our universe, I can always count on this channel. Just incredible visuals and explanations, makes it so easy to intuit everything.

@Nightscape_ Жыл бұрын

This video was very illuminating!

@zeropain9319 Жыл бұрын

lol

@drrayman1435 Жыл бұрын

“Let there be light!” And everything started! 😊

@amakaoguejiofo6307 Жыл бұрын

Simple

@greeceuranusputin Жыл бұрын

Thanks for shedding some 'light' on the subject.

@TM-yn4iu Жыл бұрын

This video was magical - both in fact and "speculation". Light is the memsmorizing flicker we see in the night sky, it allows us to move about in the dark and moreover creates hope and guides us in dark moments. The latter may not be of the same principle, but I will end believing it is - in hope and light. Thank you again, great video sharing science in a way that informs and enlightens.

@JdSpoof Жыл бұрын

This gives a whole new meaning to “Let there be light.”

@michaelfrankel8082 Жыл бұрын

How so?

@chimmy___ Жыл бұрын

God knows how to make a universe.

@AB-et6nj Жыл бұрын

@@chimmy___ "When God began to create heaven and earth---the earth being unformed and void, with darkness over the surface of the deep and a wind from God sweeping over the water---God said, 'Let there be light' and there was Light." Hmmm, what's this "surface of the deep" preceding the creation of heaven, earth, and light? Funny how that part is always skipped by Christians when they talk about how "let there be light" is the big bang

@chimmy___ Жыл бұрын

@@AB-et6nj The short answer is that the way I understand Genesis 1:3 is that it is referring to the creation, not of the universe (and therefore the big bang), but to the creation of the solar system. According to physicists, the way a solar system forms, a massive interstellar nebula condenses through gravity. The slight angular momentum produces a significant amount of spinning as the gas cloud condenses and heats. As the material collapses toward the center, the material which remains farther from the center produces smaller condensations we call planets. The material at the center eventually becomes so dense and hot that fusion begins. At that time, light is produced. Later, the planets which form cool to the point that they have a solid surface. In the case of the earth, the ocean formed, as well as an atmosphere. Eventually, folding and other motion of the crust produced continents which rose above the oceans. I believe this is in very good agreement with the description in the first several verses of Genesis chapter one.

@AB-et6nj Жыл бұрын

@@chimmy___ I don't know why I bother, but it's a real stretch to say this is an account of the origin of our solar system. Not only could it have been worded much differently, but that description doesn't cover interstellar nebula and gas clouds at all. It doesn't say gas clouds, it says "the surface of the deep." And note the order of things: primordial waters preceded light itself. You know a much easier explanation for this is that Genesis borrowed from other ancient Near Eastern myths, such as the Enūma Eliš, which conspicuously had similar openings, and which also espoused the view of primordial waters preceding creation.

@LQhristian Жыл бұрын

Good question and answer! Another way to put it: Energy = the ability to do work, while Photons/light glorify any work done (while carrying information)!

@lahockeyboy Жыл бұрын

another fantastic video, Professor

@Italianjedi7 Жыл бұрын

I love LOVE this video. I finally understand that information and light are likely the same thing. I am studying to be a librarian and my official job designation is Information Scientist so I am also really a Light Scientist! However I have two questions for you and they are highly speculative so if you don't know an answer, that is totally cool. 1.) You mentioned that there might be a hypothetical form of life that could exist without light. In your mind, what would that lifeform look like? Could it exist in a distant part of our universe that is devoid of light (assuming the universe is infinite and Big Bang bubbles are all over creating a "multiverse") . 2.) If information is light, hypothetically, if something could move FTL; would it not be considered information anymore or a type of Post-Information? As always, thank you so much for your wonderful channel!

@ArvinAsh Жыл бұрын

Thanks for your comment. I was speculating about life in a DIFFERENT universe where electromagnetism did not exist. Such a universe would be nothing like ours, and life would be questionable, But in our universe, where electromagnetism does exist, life is absolutely possible without any light. Such lifeforms exist on earth for example in deep sea vents and and caves where no light gets in. Regarding FTL, such an object would not obey the laws of cause and effect. It would appear to be everywhere at once.

@Italianjedi7 Жыл бұрын

@@ArvinAsh Oh yeah. I know some life can exist in dark environments but thank you for clearing it up! Wow. That is cool about being everywhere at once for FTL. That is a new idea for me. Thank you!

@pwinsider007 Жыл бұрын

@@ArvinAsh light is associated with electromagnetism force,does equivalent of light exist for other fundamental forces?

@shiblyahmed3720 Жыл бұрын

@@ArvinAsh.... can we call those life forms 'angles and demons'!!:)?

@rd9831 Жыл бұрын

@@ArvinAsh but even though visible light would not be experienced by those life forms, any movement or any chemical function taking place would involve virtual photons, and thus if electrons exsist, light exists. . Did i understand your video correctly ?

@mikel5582 Жыл бұрын

I appreciate that you added some conditions to your use of the word "purpose" but I wish you'd have been clearer that the "light" you're referring to includes the full EM spectrum and not the more common usage that's limited only to visible light.

@HakimJamil94 3 ай бұрын

Interestingly, his usage of Light to include the full EM spectrum is sound with the Arabic word "Nūr" and also the Bahasa Melayu/Brunei/Indo word "Cahaya" which comes from the Sanskrit word "Chāyā́" (Lustre, Reflection, Shade, Shadow), a doublet of "Chā̃v" and "Sāyā". The universe is just Nūr (Light) filtered by Turāb (Dust).

@nvrp Жыл бұрын

Thank you Arvin!

@muthukumaranl Жыл бұрын

Absolutely awesome video!

@rudrrrudrr5788 Жыл бұрын

Thanks for explaining these concepts easily ❤️❤️

@jayatigoyal8103 Жыл бұрын

Amazing video, very informative Arvin! Also, what do you think about this.. 'Initially, there was light, and it wanted to expand.. That's why there is universe whatever it is.'

@dr.paulj.watson4582 Жыл бұрын

Really enjoyed this video.

@thebeelight Жыл бұрын

great video, thank you!

@Dxeus Жыл бұрын

I haven't watched the video yet, but I am impatient to ask a few questions. When a photon hit an object and bounces, does it store the information about the surface on which it got bounced? Where and how does the photon store that information? Can I say, that any large object e.g., a tennis ball bouncing off of a surface will have information stored about the surface and I will need a machine/system to read that information from that ball? I mean to say, are the laws of transmitting information are same for larger objects like a tennis ball?

@ArvinAsh Жыл бұрын

Light undergoes processes prior to hitting your eyes. Its amplitude, polarisation, frequency, pulse time get affected. These processes carry information about the object that it is being reflected from. For example, when you see a yellow tennis ball, it means that yellow light was being reflected back, but other wavelengths of light were absorbed. You also view it as spherical. The light waves hitting your eyes create shadows and depth. All these aspects carry information about the object.

@RobertSeacordC Жыл бұрын

@@ArvinAsh so the answer is "no" then, because the actual photon is unchanged.

@onlyeyeno Жыл бұрын

@@RobertSeacordC That was not how I understood/interpreted his reply. To me it was neither a "straight" Yes or No, but rather as is so often the case it was "it depends". As far as I understand it a photon doesn't have any "embedded information" apart from it's "own basic attributes" such as frequency , amplitude, polarisation, direction... And these "attributes" really doesn't carry any information regarding anything "external to it" etc.... So that would make the "answer" NO. But that is only if You don't have any "information" about the context of that photon (or rather it's causal predecessor), such as for instance You know something about that phonton's "attributes" prior in (Your) time. Because if You do, then the photon ""carries information" about the fact that "something has happened", something has made "that photon change" from "it's previous state" to it's "current state".... To me the question regarding "what is carrying information" is a very "tricky one" and not easy to answer without very clear definitions and context,. To make a (possibly overly simplified but still) analogy to "patterns". (As far as I understand) Information is in essence "patterns". How ever patterns can't often (never?) be "discerned" by looking on single "piece" of the pattern. When looked at "in isolation" that "piece" seemingly holds no particular (pun not intended) information. How ever when looking at that "piece" in it's "context" (as a part of the pattern) then "all of a sudden" You realise that the "piece" actually is a vital part of and carries information about that "pattern"... Apologies for the "rant", but at least that's my 5C's regarding this (i.m.h.o.) very interesting but complex question. Best regards.

@Chizzoide Жыл бұрын

@@onlyeyeno I read you and seems like a reasonable answer, and I have to suggest you control your use of parentheses and quotes, makes the reading difficult and confusing(diverts attention). Good answer tho

@DrDeuteron Жыл бұрын

@@onlyeyeno photons don't have a frequency and amplitude, since you need a reference frame to have to those. A photon on its own has a polarization.

@benjamindover4337 Жыл бұрын

I once heard a theory that matter actually is light that has "stopped moving".

@ArvinAsh Жыл бұрын

That's an interesting way to look at it. I state in the video that if it were possible to convert 100% of an object's mass to energy (this is not possible), it would all be in the form of photons. And if you had enough energetic photons, you could theoretically convert it to mass.

@enriquea.fonolla4495 3 ай бұрын

that is very intriguing and poetic at the same time

@youfilin Жыл бұрын

Arvin, thank you! Question: What kind of information are we talking about? Not in the human context, but for the universe? Gravity information between objects (is this by photons)? Electric charge? But for what? What kind of life is the universe living?

@katakalyptica 3 ай бұрын

This was one of the best explanations, I ever had heard. Thanks

@nHans Жыл бұрын

As others have pointed out: If the Electromagnetic Force did not exist, the Weak Force wouldn't exist either-it's both or none. Taking this argument further: If Grand Unification is real, then the Strong Force wouldn't exist either. And if one or more ToEs-for example, String Theory-are real, then even gravity cannot exist. So we have no idea what kind of an alternative universe we're talking about.

@KigenEkeson 11 ай бұрын

So good! Thanks.

@GarryBurgess Жыл бұрын

Wow, this is your best video because of the amazing content!

@RickClark58 Жыл бұрын

You said something extremely profound which I think most people don't really grasp. You mentioned that what we see of the world around us is from light bouncing off an object and hitting our retinas and producing an electrical signal in our brain. What this means is that we do not have any direct connection to the universe around us. Everything we know of the universe is from electrical signals in our brain. What we think of as reality is actually the brain interpreting the signals we receive through our senses and creating a reality based on those signals. The universe we see around us is actually a continuous hallucination that our brain creates based on the input of our senses.

@audiodead7302 Жыл бұрын

Simulation is a better word than hallucination.

@alfadog67 Жыл бұрын

Another profound cookie roaster is that light doesn't really bounce off an object. Instead, the light waves are absorbed, and then new light waves are emitted. Stuff that we see is little all light-powered light machines.

@ArvinAsh Жыл бұрын

Correct. We have our other senses that back up what we see, so the universe certainly appears to be real. But again, the other senses are also picking up electromagnetic signals which our brain is interpreting. So yes, this is potentially a profound existential dilemma!

@RickClark58 Жыл бұрын

@@audiodead7302 I am not sure about that. A hallucination occurs in the mind. A simulation occurs in a computer. I used hallucination because that is the term that is commonly used in this sort of discussion about the mind.

@RickClark58 Жыл бұрын

@@ArvinAsh I have no doubt the universe is real, but is it really what we think it is? And can we ever really know the true nature of the universe? That is what I wonder.

@Expireddepression Жыл бұрын

Arvin is rly cool.

@jeremahosborne6602 Жыл бұрын

Too hor r o

@eonasjohn Жыл бұрын

Thank you for the video.

@massimoacerbis8138 Жыл бұрын

This guy knows a lot And has a passion to spread his knowledge

@suecondon1685 Жыл бұрын

I'm obsessed with light, I'm convinced it's the most mysterious, eerie thing in the Universe.

@Kyle-nm1kh 9 ай бұрын

I'm not particularly religious but in Genesis that was the first thing God created. Perhaps understanding light is the key to understanding the rest?

@kunal682 Жыл бұрын

How simply you explained so many theories and experiments in this 15 minute video clip is incredible to say the least.

@surendrakverma555 Жыл бұрын

Very good. Thanks 🙏🙏🙏🙏🙏

@alejandrorigeiero3457 Жыл бұрын

These vids are the best. Super easy to understand.

@leontich46 Жыл бұрын

Because they are utterly false, just to hook you so you think you understood smth. Light is a manifestation of the EM quantum field. Photons are strictly speaking not particles, they are excitations of the EM field.

@ArvinAsh Жыл бұрын

@Alex B - Your comments would a lot more meaningful and helpful to viewers IF YOU BOTHERED TO ACTUALLY WATCH the video...because in the video, I address EVERY SINGLE ONE of your concerns.

@harshdwivedi5215 Жыл бұрын

Sir,do you work at NASA or somewhere else?

@Razor-pw1xn Жыл бұрын

Information is a creation of intelligence. In fact, there is no information without intelligence. It is being suggested here that the purpose of the light is the transmission of information. Then, the main purpose of light is for intelligent beings to exist, which is very creationist

@ArvinAsh Жыл бұрын

There is no intelligence without information, but not vice versa. Information exists in a lot of places with no intelligence.

@Razor-pw1xn Жыл бұрын

@@ArvinAsh It's the first time I don't agree with you on all the hypotheses in your videos, but I'm glad it's on a topic outside of physics. Data needs to be processed for the information to make sense, for example, there may be a lot of data stored in a computer and it is not until a program, intelligence or AI interprets it that it emerges as a category of information. Similarly, there is no logic or mathematics. On the other hand, objects and data do exist because they do not need to make sense. They exist and interact following intrinsic laws without further ado, without exchanging underlying information. Unless you consider the universe an intelligence.

@ArvinAsh Жыл бұрын

@@Razor-pw1xn I agree that for us humans to make use of information, we have to process it. But "information" exists all over the place. A rock carries information about its history with the contour and scratches on its surface, for example. The sun is sending information about itself via the photons it releases. In fact, entropy is all about the increase in information in the universe. Maybe you are defining "information" differently than information I'm defining from a purely mechanical physics perspective.

@Razor-pw1xn Жыл бұрын

But a rock carries information where? You would have to say that the rock itself is information, but then it is not that the photon transmits information, it is that the photon is information. In the same way, everything that is not a photon is also information and therefore everything also transmits information. So, for me this type of information is not necessary since it is the object itself and its attributes. I mean, objects don't need a "channel" through which anything is transmitted. Information is a concept like time or space that does not exist outside of the mind.

@YISTECH Жыл бұрын

@@Razor-pw1xn well put.

@brianfileman Жыл бұрын

From the title I was tempted to scroll on, because I assumed the term ‘purpose’ implies some intelligent design. But I had a quick look at the comments and proceeded to watch the video. Glad that you expanded the term light to include the entire electro-magnetic spectrum. Instinctively think that the term ‘speed of causality’ is more useful though, as it is the speed limit of the transmission of information throughout the universe from the perspective of an observer.

@Rorol1fted 9 ай бұрын

Loved watching this video

@reannan1462 Жыл бұрын

It was no accident or coincidence when in the Bible, God "spoke" (sound waves), and said "Let their be light". If you read the first few sentences of Genesis, it is a description of the creation of the quantum world. Absolutely fascinating. Love your videos and have subscribed.

@Efecretion Жыл бұрын

@davidm.steeves57 Жыл бұрын

Thank you for your well-thought-out explanation of the nature of light. Please, can you explain why light travels at "the speed of light"?

@soundcoremusicmix Жыл бұрын

Awesome! 🎧🎶🤩

@gwentchamp8720 Жыл бұрын

Another awesome video 👍

@FortniteWithMyMom 4 ай бұрын

Holy moly what a great video!!

@Unshou Жыл бұрын

Fascinating - hadn't really looked at it from this perspective. Really nicely explained. However, as I understood it, it's not so much that light is the reason we exist but rather the electromagnetic interaction is the reason we exist. Light just happens to be a by-product of this interaction and carries information and energy to the rest of the universe about said interaction.

@nothingmanofgod.6288 Жыл бұрын

Your idea of thinking is always interesting awsome i can understand it even with out the real anser at all😕😏

@DMT4Dinner Жыл бұрын

I learned so much in this video

@incrideableindia5303 Жыл бұрын

I am thankful to the internet for content as these!

@DishaMalik751 Жыл бұрын

Nice one ♥

@NathanRichHotpot Жыл бұрын

5:46 (photons' energies go from gamma to light spectrum while bouncing around in the sun). Can you explain or point to a video explaining where this energy goes? Thanks.

@schmetterling4477 Жыл бұрын

That is stretching it a bit. The internal temperature of the sun is approx. 15 million K, roughly 3000 hotter than the surface. That pushes the black body spectrum peak from approx. 2eV (green) to maybe 6keV. I would call that "very mild x-ray energies", at most. The energy is transported by radiation from the core to roughly 75% of the solar radius, I believe, and then convection takes over as the main transport mechanism. The main difference is time constant. Radiative transport if very slow and takes a hundred thousand years, or so, while the convection zone churns this energy inside out in weeks, it seems.

@oscopin74 Жыл бұрын

I really enjoy your content Mr. Ash. You have great way a breaking it town for idiots like me with no real education in physics, other than basic high school stuff, from decades ago. Keep up the awesome job of educating us old farts and making it simple for us. 👏👏

@JoeParizer 10 ай бұрын

Great vid!

@edcunion Жыл бұрын

These videos are great high school introductory physics study guides, you must have been a teacher in some capacity at some stage! It's good to remember, beside mediation of forces light carries information, is a kind of memory in motion to sub light speed observers. Light is also ageless according to Albert, it exists out of time. When tired and more bent away from us it gets red, when more energetic and bent toward us it turns blue? So it must be entangled with a gradient or spacetime curvature, as time simultaneosly speeds up and slows down depending on lights wavelength? Regardless of frequency and wavelength, from its constant light speed viewpoint, every event in the universe happens at the same time, instantaneously? Why Andromeda Dick's and Milky Way Jane's photon recepting eyes realize instantaneous particle entanglement, the light knows something we dont until we look, being sub-light sensor platforms, we have to watch and wait for the light to traverse the space gap, as we are not massless like it? Being inertial observers we are tugged on at light speed from all directions while light is free to fly like a Hamiltonian arrow toward the surrounding tugging horizon and/or centroid? At universal t= 0, light must have been fully entangled with Planck's-Albert's universal spacetime acceleration radiation, i. e. spacetime curvature, that LlGO has proven travels at the same speed c? The Planck gaps provide the electromagnetic and free fall gradients, perhaps chirality/spin and memory space for stuff to happen? Things in free fall are witnessed at the constant speed of light to our eyes as we spiral through spacetime? Sorry, too much fine Ethiopian java speaking now! Nothing to see here said the black hole at the bottom of the coffee cup!

@hans-jurgenkallweit2767 Жыл бұрын

Wonderful video. Every photon carries information from its origin. So spectral anaalisis can determine the chemical element of a star, what sent the photon to us .

@doctor02new 9 ай бұрын

Well done indeed!

@JohnJenkins-ib5wh Жыл бұрын

Arvin you are awesome. Even my wife that thinks that Science is a boring subject loves your videos 👌

@ArvinAsh Жыл бұрын

Happy to hear that! Thank you.

@secretAgentRandyBeans11 Жыл бұрын

30 seconds into the video and I'm already mesmerised. Sold.

@giuseppelogiurato5718 Жыл бұрын

Finally! Someone who talks like a regular person; I can actually listen to this! So sick of all these science channels with weird and/or foreign narrators.

@tonyrony1943 11 ай бұрын

You have a great real concept. It is light a kind of essential energy which make survive all the things in our universe except nt a single bit material

@andrewhamp2893 Жыл бұрын

Thank you for taking up this issue. Great video... Now, just riffing here, but could it be that if information is the base fabric of the universe, photons/light is the most efficient way to encode "preserve" information? Sort of like a conservation of effort?

@ArvinAsh Жыл бұрын

Sure, but the universe doesn't have a lot of information carriers. Gravity and electromagnetism are the two "carriers" of information. Both travel at the speed of light.

@jeffg4570 11 ай бұрын

@@ArvinAsh. Is the information carried by the photon just it’s frequency, or is there more to it than that?

@juliavixen176 Жыл бұрын

It would be nice to explain at 10:53 just where that c² came from. For anyone wondering: If you confine light inside of a massless box with perfect mirrors on the insides. It will bounce back and forth forever, and because light has momentum, it pushes against the walls of the box each time it bounces off a mirrored side. Since it pushes against each side equally, the box doesn't move. Now, from outside the box, if you push on one side, the light will push back proportional to its momentum... it will resist being accelerated... this is inertia... also known as mass. From classical physics, momentum is mass times velocity p=mv, force is change in momentum per unit time F=dp/dt, or if mass is constant, mass times acceleration F=ma, and kinetic energy is one half of mass times velocity squared KE=(1/2)mv² . Mix in the Lorentz factor, shuffle this around with the velocity being *c* and you'll get that E=mc²

@pjhtaylor Жыл бұрын

Would the inertia of that box be greater if the frequency of the photons it contains is higher?

@juliavixen176 Жыл бұрын

@@pjhtaylor Yes, because E=hf

@pavolusak2488 7 ай бұрын

If the junck of the energy flux of the photon, lambda long, is bent to the toroid with radius r = lambda/(2.pi), the mass is created m=(htrans/c).(1/r) i.e. m[kg].r[m].c[m/s]=htrans[J.s] and the energy, flowing in the (elementary particle) toroid, is E(energy)=h.f=htrans.omega=htrans.(c/r)=m.r.c.(c/r)=m.c^2 The energy of the toroid related to the toroid mass (the measure of the non empty vacuum inertia to the Poynting vector bending, attributed to the toroid [center]). For the flow of the energy ~0.511 MeV (in the electron or positron toroid, with r~ 3E-13 [m], at speed of light c), it gives (invariant) mass m ~ 9E-31[kg]. More details on ResearchGate ("Electron as a quantum of the electromagnetic energy flux", etc.) :-)

@3rdcoasttoast201 Жыл бұрын

Maybe it's because what we call a "particle" is the interaction between energizes and forces. We detect waves as the energies and forces dissipate over distance. Also when an object travels along a path and spins around an axis, the path viewed from the side is a wave

@alfadog67 Жыл бұрын

Hi Professor Ash! Since light behaves like a quantum object, that means it travels in superposition, thus its physical properties are modeled by its wave function. Each collapse of an electron energy state causes a new wave function. But these separate, non-entangled superpositioned wave functions don't interfere with each other, but rather only themselves (as demonstrated by the double-slit experiment). Does that mean that ALL the light traveling through spacetime has that same crisp, clean, motionless arena in which to propagate?

@bog-monster Жыл бұрын

Yeah Baby !! 👍💯👌😜

@overlycreative1 Жыл бұрын

great elementary question and one that should be answered as common knowledge to every person.

@clurkroberts2650 4 ай бұрын

Fiat Lux. I’ve always loved light. As a photographer, I studied light as a tool, in essence painting objects with light. But more than that, I realized that visible light, being a small part of the electromagnetic spectrum, is one of the most amazing elements of life.

@MxGrr Жыл бұрын

@arvin Couldn’t we consider space-time a type of medium? In the way that “ether” was thought to be?

@tinytim71301 3 ай бұрын

Great content.

@marcocurrin8122 Жыл бұрын

You should talk to all your friends about it and start going through all the scenarios customer scenarios you go through with your friends the more they’ll start wiping those scenarios out and coming up with better once and then finally you’ll get to the final understanding of where we’re at and what’s going on around us right this moment

@johnc9768 Жыл бұрын

well done

@tejaswi9i Жыл бұрын

One brilliant video

@wailinburnin Жыл бұрын

An aside, if you pause at 8:36 with closed captioning you will read: "In other words, no light means no atoms, no cars, no houses, no you and me. and no universe". Look at this statement. It shows the fundamental ubiquitous nature of the automobile in Arvin Ash's society. It further alludes to a suburban society of "...cars [and] houses...". Humans are subject to cars now, the cars rule, and with them, the enslavement of a built environment of sprawl. We need not fear AI, we are already serving relatively mindless automobiles: kzfaq.info/get/bejne/l897qK9escq5Yp8.html It is apparent in our most glib comments. Bravo on this video, excellent description of physics of light, btw!

@ArvinAsh Жыл бұрын

Insightful observation Indeed! We are slaves to our technology.

@lukestockett252 Жыл бұрын

I'm glad you added the philosophical aspect, since science during most of human history has been blended with philosophy... until recently. And yes you make a good point that the purpose of photons is to communicate information, which would be pointless to try and disagree with. However, there is something else that photons do: redistribute lateral gravity back towards their point of origin. Which is no doubt a way for a star (for example) to recover a portion of the gravity that is lost while emitting starlight. This can be proven by the way that photons utilize a gravity-slinging effect, built into their sub-structure, to maintain their lightspeed travel.

@theultimatereductionist7592 Жыл бұрын

9:30 "totally speculative life form" LOL!

@relativeparadox9567 Жыл бұрын

The idea that the 'why' for anything in the universe is for us to know or that we would even be advanced enough to comprehend it is a prime example of human hubris.

@ronjon7942 Жыл бұрын

Then you're fortunate that people who made KZfaq and the tablet you're using respectfully disagree, at least to the extent possible.

@relativeparadox9567 Жыл бұрын

@@ronjon7942 just cause you can use things in the universe and manipulate them in a way that we can put them to use for millions of application does not answer the questions 'what is the universe and why is it there and what actually is anything that it contains' for all it's impressive results, science cannot touch these questions.

@YISTECH Жыл бұрын

@@relativeparadox9567 my thoughts too, as well. Some things, just cannot be explained, and will, never ever be explained.

@Timbucktoothed Жыл бұрын

Helps to know the differences between Bosons vs Fermions.

@nbrown6648 Жыл бұрын

Very nice video as always. But ... I feel the difference between photons and virtual photons was a bit glossed over, as if the electromagnetic force was mediated by "normal" photons ... and the whole central role of light/photons in this presentation rests a bit on this assumption. If the two were identical we would not call those that mediate the EM force in QED "virtual" photons, right ? Would it be possible to elaborate a bit on this difference ?

@ArvinAsh Жыл бұрын

Yes, in retrospect, I agree with you. I could have explained that better.

@RobertoCerv90 Жыл бұрын

I have question. The máss like a electron it's .511Mev. But that it's the energy or mass who need to pass tru higgs field. But that means That's the only energy on a particle or can be more without need a momentum. Or if electron and positron kills the energy its only 2(.511Mev)