I never realized that the split could be done on a low budget. That's cool!

I love this channel. It's so underrated. No fancy graphics or animations. You cut through all the gunk with simple and clear explanations.

Great explanation. Love your videos. But here, a little mistake slipped in at 1:20: In order for the double slit experiment to work, you don't need plane waves. It also works with curved waves in the same way. The reason why it doesn't work with a light bulb is the low spatial coherence of the light in this case (which is an entirely different beast than curvature). It basically means, that because the light bulb is an extended light source, the light waves incident on the slit are coming from many directions at the same time. So they create many of these interference patterns which are mutually shifted and therefore wash each other out. Fun fact: If you place the light bulb very far away from the slit, it would in fact give you an interference pattern also in this case (with very low intensity though).

You basically explained quantum mechanics in a simple way it's amazing.

People are particles, but when you put them together, they act like waves

light is actually made of lasagna

This guy just made my Physics class so much more interesting

When studying precious stones (opal), we were under the impression that different colours expressed was the micro beads in the silicate were of different sizes and behaved like prisms, re-enforcing individual colours (red, green and blue).

You should do the last experiment with blue light.

This video really made my whole day. :) The best part is explaining such topics with simple, easy and fun experiments. You are doing a great job. A video on Heisenberg's uncertainty principle is requested. Thanks. (Love from India.)

If only the double slit was to be made with blue light, perhaps we would see it painting it wide spread

So approachable and down to earth yet passes on so much knowledge. I love the genuine excitement. give this guy a laser pointer and a sharpie and some space in his garage and he makes me feel like I am learning more than I did in uni! yo PBS or TVO or BBC or someone get this guy a show!

Double slit glow in the dark project was lit.

I wish there were a better(easier)way to explain the delayed choice quantum eraser experiment. Great job on this video!! Keep it up!

Why didn’t you: Use the BLUE light with the make-shift double slit on the glow paint? Would we have seen an interference pattern? Particle like result? Both? We will never know.

No one: Not a single soul: This dude:just has potato chips taped to his desk

Someone here said your channel is underrated and I think that's probably true. You are doing a really great job explaining complicated science topics in an interesting way. My 8 year old son and I have been watching them during dinner for the last few days and we are both really enjoying them. My son usually only gets excited about basketball games or dude perfect but I can see him getting excited about what you are doing.

wow, that just explained to me how the electron orbitals work better than my chemistry teacher could in a decade xD (seriously, i`ve never really understood how orbitals work but now i do). Thanks for all of that science input, you can explain it like nobody else could

I wish I were born in a simpler universe where light would be either particle or wave.

@The Action Lab, the experiment you do around 7 minutes in, isn't the fact that you used a *red* laser but an LED flashlight (which emits blue light, especially since that appears to be one with a higher color temperature) a big confound? You had already established the red light won't charge the glow in the dark surface, and that blue light will, so it seems hard to draw any conclusions about the quantized vs wavelike properties of light from that demonstration alone.

“Then after you’re thoroughly confused, I’ll explain what light really is.” I’ve never related more to anything in my life

So basically: Schroedinger's light.

Chingon el canal.! Dice un dicho: "Solo puedes decir que entiendes algo, si puedes explicarselo a tu abuela y hacer que ella entienda". La encarnacion misma de esta frase es este canal. Sigue con el buen trabajo. Saludos desde Mexico!!

The best explanation of the particle-wave duality I have seen on youtube. Bravo.

Light has the properties of a quantized wave: neither wave nor particle, neither fish nor fowl. The particle characterization of EMR has been superseded by quantum field theory. You don't need to invoke particles with momentum to explain a transfer of energy from photons to electrons. None the less, your double slit setup with the laser pointer is fun to see.

At 7:00 you are using a red laser for the double slit. Try it with the blue laser.

Something I've been thinking about for a few days is what would happen if you shoot the interference pattern through a prism. Be it a pyramid or cube, I was wondering if that would give a view of the "wave like" property through "space" of the beam as opposed to just having it hit an opaque surface. (Basically like ballistic gelatin for light)

What an excellent presentation. Thanks for putting this on here. It's so cleverly explained.

I hope this endeavor works out for you. I have yet to watch a single boring video from you. You are one of the few that gets a guaranteed slot in my limited "watch stuff" time :-)

first you confuse us by telling us something that we never almost talked about and then clear everything out you are great

This was a great video! Understood this concept better with this video than any other explanation in the past. Wonder if you could try the wave particle experiment with the blue light too next time.

Hey Action Lab, you always have interesting experiments, usually in some area I am investigating! Thanks. I have studied the light 'wave-particle' duality for a long time and I have concluded light is a wave with some particle-like properties. Specifically, light is the vibration of the ether which is most likely the neutrinos that pervade the entire universe. This is the 'quantum fabric' that makes up space and is the stuff that vibrates to make light. Light acts like a particle when a wave of the quantum fabric finds a particle that can absorb it and that wave collapses instantly into a localized energy transfer. The instantaneous behavior of light is confirmed in the fact that light has no inertia - it moves at its top speed instantly (from zero to 300,000 in 0 sec.) and it stops just as quickly. This instantaneous behavior is also confirmed by experiments showing quantum entanglement. Light is also confirmed as a wave because the energy of light is determined by its frequency, not its mass or velocity. The failure of modern physics to admit an ether makes the universe appear irrational. I have heard that the Michelson-Morley experiment has been overturned, and a drag component has been detected in light when the experiment is done with more precise instruments. The quantum fabric is also the stuff that rotates to make a magnetic field and is the source of fields in general, with attractive and repulsive properties, depending on the particle and / or direction of rotation while interacting with the field. These fields include the electric field, the magnetic field, the weak nuclear force and the strong nuclear force fields. Each field is determined by a frequency interacting with a particle and each one drops off by a particular inverse exponential - 2, 3, 4 or 5, respectively.

Simply light and other particles are in superposition so it isn't a wave or particle but its still both before you messure it

Way to go on your 8 hundred thousand subscribers! This is way over my head by way interesting! l loved it!

You are great; thank you for showing the experiments and the theory behind them separately.

I'm wondering if the color of the wave is pertinent? The laser you used was red, try a blue one. Also, how about shining both types of light, white incandescent and white colored laser through prism onto that sheet to see if what colors are absorbed. Might be pretty interesting. Love your show!

Can we PLEASE PLEASE PLEASE have more of quantum mechanics experiments? Please

Nice video, but you were a bit off-base when you started talking about the momenta of photons in the phosphorescence of the glow in the dark paint. Light having momentum isn't really relevant to that particular phenomenon. That comes into play when you talk about things like Compton scattering (particles being deflected by light) or the photoelectric effect (electrons being ejected from atoms by light). Your explanation is mostly correct and I don't mean to be pedantic, but these demonstrations are about energy, not momentum, and you should not use the two terms interchangeably. The reason phosphorescence cannot be explained by the wave model is, as you say, the energy carried by a wave is related only to its amplitude. Thus, an intense beam of red light can have more energy in total than a dim beam of blue light. However, no matter how intense the red light, it cannot excite the atoms in the paint. This tells us that there are particles within the beam of light which interact with the electrons individually that these particles of light must have the correct amount of energy to interact with the electrons in the paint or the electrons will not be excited, and that the energy of each particle of light is different for different wavelengths of light. That said I always enjoy your videos and there are a few I show in my classes every year. Keep up the good work.

Thank you. That was very articulate. Not everyone can explain the two slit and particular properties of light in a way that makes sense. I can tell you enjoy teaching

So true level of knowledge.. I've seen 100s of videos on atoms and electrons but nobody could tell so clearly that how electrons move like you explained it.. would be very great full to watch a detailed video on explaining all about atoms, electrons and quantum mechanics.. and how they work and how are they different in all elements? Thanks :)

Titles like these blow my mind into pieces

Nice and very informative Love the hard work you put into each video mate

this is my first time seeing the double slit experiment in actual. thank you!

It is possible to make that "Lit paint" glow when flashed with an ordinary commercial green light laser pointer??? If so, could you make a glowing interference pattern???

Isn't the laser pointer a red light you said that red light cant light up the lit

My quantum mechanics calculations show a 100% probability of you having over 800,000 well deserved followers! Great channel. Congratulations.

Great video. A question that I find never explained in any double slit video - if we fire single particles at the slits surely we aim them at the central block rather than at one slit or other right? If so then the expectation should be no pattern at all as should hit the central block. However actually goes through one or other slit, this must mean the single particle is bending its path once decides which slit to go through. Surely it is just as amazing that the particle decides to veer off a straight line as the overall result of the pattern made?

thank you for this fascinating and well explained video. I still don't quite understand quantum physics but also feel I'm getting closer to understanding it

You just explained my 10th grades lessons in 11 minutes... and I actually understood it this time.

Nice and informative video there, great job!! Also Can you calculate the speed of light?

I've seen many of your videos but this video made me subscribe your channel. Good job man👍🏼

Came in expecting to learn about light, ended up learning about quantum mechanics. Great content!

You actually don't need two slits you only need the center break. You can do this with a sewing needle (not necessary to use the eye of the needle)

03:10 This thing is Lit !

Spectacular job of demonstrating and explaining that thorny issue.

Absurdly inexpensive experiment for the magnitude of information conveyed. :) Cleared up a few things for me

When I took physics in college my prof taught us about light being both wave and particle. I have puzzled over this since then (mid-1970s) But you said something that tied it together when you showed that it isn't just light, it is everything else too! Now I have even MORE to puzzle over! :)

"Light cannot be anything else but a longitudinal disturbance in the ether, involving alternate compressions and rarefactions. In other words, light can be nothing else than a sound wave in the ether." - Nikola Tesla. No bulb emits light waves just like a person in the middle of the pond moving his hands in water is not emitting any water waves. Light is the ether itself under vibration. And if there are particles of light, they are particles of ether acting very much like how air acts for sound waves.

one of the most enjoyable and knowledgeable channels ....just love it 💖

I came across the double slit experiment being mentioned in a game. Immediately searched "double slit experiment action lab," and sure enough, you explained it well. :)

I'm confused by one thing: would the double slit laser make the paint glow if a blue laser was used? I thought red light couldn't make the paint glow at all

Red is just the wrong frequency to get that resolution

Thank you for the video. This helped me understand the Particle-Wave Duality better

Amazing explanation with such a simple experiment. Thank you!!!

We need more guys like you on KZfaq! Acually educating the public instead of making them dumber like some other youtubers:) thanks bud and keep up the good work!

Maybe light is particles which move in waveforms 🤔

This is the may favorite video so far in your channel. I have other favorites too!

Thanks you for the amazing video brother! You are awesome on a high level.

When I had studied this topic at first time I was not able to feel this and I had started to ignore it, but after seeing this video,I can say only one word that is wow😱

You don't even need the laser. I did the double-slit with my students using a sharp knife, a piece of thin cardboard, and the the flash light on their phones.

Very cool video. Good explanation- easy to understand. Thanks for posting.

7:29 You think I wouldn't notice what you were drawing there 😆 good job LOL

Ok today i'm going to put a huge like

You: Today I'll do an experiment that proves light is a wave. Me: But it has particle properties too! You:Then I will do an experiment that shows light is a particle. After you're confused, I'll explain you what light is. Me: Savage af dude! Savage. As. F.

Beautifully put. I must say you have the skills. Can you also make a video about how a quantum computer actually works. Thanks in advance. Keep up the great work.

I always learn something from your videos. You are my practicals teacher. 😊

We should call light a warticle

One error: _"Light is a wave therefore it is everywhere"_ is false, because light is an electromagnetic wave that has an origin point and a direction and a velocity. An electromagnetic wave moves through space from point A to point B over a specific duration defined by its velocity.

Thanks. Double slit experiment was the very first video that I watched on youtube as far as I can remember. It was back in 2006 or 2007.

I love your videos. You have a great way of making the esoteric understandable. Can a wave 'wave? and can a particle be particularly particulate?

Photon's are weird, so is quantum mechanics but i'll try my best to explain this issue. To put it simply, photon's together create "Waves" but they themselves do not move in "Waves", so imagine you had a bunch of people and they were standing in a really wavy line, that's what photon's do. God this ones hard, Photon's are Particles, yes but because they are Fundamental Particles, Quantum Physics prevents us from Studying them directly because of the Quantum Uncertainty Principal. So there are a couple theory's for how individual Photon's work, one is that they each move in a wave pattern, in little packets together but this probably isn't true since it conflicts with experiments. The second is that Photon's move in a straight line, but create waves when they are made together, since Photon's are never made as Individuals and usually come in Packet's based on how they were created which produces their Wavelength and gives us different types of Light, Heat and even the entire Electromagnetic Spectrum. So now to help understand a little more, i'm going to say Photon's travel in straight lines but because of the amount of energy they contain they bunch together in Packets and that's when they create their Wave Pattern that we see in Laser's, remember there are trillions of Photons in that tiny spot so they create a wave and the energy that was used to create them makes that wavelength fairly long, resulting in Red Light. Also it's important to understand that Photons and Light Ray's are different, Light Ray's are created by large quantities of Photon's, and like i say these Ray's come in the form of "Waves". Final point, now on to the Lit Substance, light when it interacts with Protons and Neutrons transfer's it's energy to them, or as you put it "Momentum", while they do have Momentum it's easier to say that Photon's contain a certain amount of energy because we can't measure the Velocity of a Photon at the same time that we Measure it's Position, the quantum uncertainty principal. So the reason why a Blue Light is able to excite the molecules of Lit is because it simple contains enough energy to, if you shined an Ultra-Violet light on it it would shine much more, and if you shined X-Ray's on it, it would still shine because all of those have plenty of energy. Now when it comes to Gamma-Ray's the photons have so much energy that they actually start to tear things apart on the Subatomic level, that's why Gamma-Ray's are so dangerous, and the Lit would probably shine rediculously bright under it before probably being destroyed.

Man I have a hard time understanding these thingies about quantum mechanics, I am a 10 year old but I lovvvvvvee your experiments, I just can't stop watching them, thanks for making this channel, I am more of an advanced learner so I like to learn things above my level and your channel is just purrrfect for that, and thats why I subscribed by the way :)

If light is travelling at "the speed of light" it would have no causation or time. To an outside observer wouldn't light exhibit all possible states and travel as a wave of all possibilities? The moment you interact with it's location this would force a causation event. So is light really just a particle after all?

Such a clear, simple and thoroughly explained wave particle duality

It's really just a wave traveling through the aether though

Could you do some experiments with gamma rays

Amazing. Simple and concise, just what i need to explain double slit experiment to my kids.

I am a high school student, and I learn more from one of these ten minute videos than i learn over ten days in school.

Conclusion: So the Naruto's Rasengan also has both particle and wave property.

U forgot to give credits to Einstein, youngs, huygens, de broglie 😅

The glow pigment doesn't care that the laser was low or high intensity but that its wavelength was too low. The commonality between the Lightbulb that didn't light it and the laser was they were both in the red wavelength. If you used a blue or green laser it would most likely work, as the lightbulb that did light it despite being weak had multiple bands of light higher than the red laser. A different way to think about it is not that the Lasers intensity mattered but its frequency, the red is too slow to push the pigment, like the delay between waves isn't enough to keep it charged or the red particle doesn't have the free electrons there's something about the red light that regardless of its amplitude wont ever push the pigment. Unless you maybe try a higher grade red. Ofc any future tests with stronger or weaker lasers should have eye protection stay safe!

Ydse I didn't thought this will be this cool thanks for the demonstration 🤓😍

Congratulations for 800k subscribers I'm Dhruv from India

Would be stellar if you enabled public subtitle contribution; this is a great video and I wanna get my quantum chemistry prof to show it in class, but not everyone speaks English and the automatic subtitle/translation is really subpar so I would try adding the translated subtitles myself but that's not enabled here

This guy is so much better than other science channels like the Science Asylum, or Arvin Ash, etc. I watch them and don't feel I can intuitively understand any better. They always gloss over or hide behind math to explain the hard part. And the comment section is full of compliments and adulation. But the people don't REALLY understand. They just parrot the equations and the same ol' talking points. I feel it is like having to explain a lawn mowers operation to a child over the telephone. The child can say they know how the machine works-- the battery turns the engine causing the pistons to move to up and down in the block and that process pulls air thru the carb and the carb mixes air and gas utilizing the venturi effect, blah, blah... Then, after hearing several times, the child can then say they understand a mower just because they can parrot the words w/o actually knowing what the words mean, like a cam shaft. I often watch this guy and say, "Ooooohhhh, NOW I see..."

Thankyou so much.. u r doing wonderful stuff.. Ur videos helps to clear my doubts...

Can you please try doing the same experiment...but this time, put an observer or indicator or camera which will collapse the wave function of the light... It will be fun to watch what happens with the lit paint :)

I am sorry but I have to correct one mistake. Light from a light-bulb doesn't work not bcuz light is "curved" but bcuz it is not monochromatic. In order for the experiment to work all light coming from the source has to have the same wave lenght (which is most efficiently duable with a laser) therefore it has to be monochromatic. Back in the day, when this experiment was initially done it was done by a simple source of light and a monochromatic lense put in front of it, so the wave lenght would be the same. That's why the experiment doesn't work with a light bulb or with initially 2 different sources, not bcuz light is "curved" (to be fair I don't even know what he ment by that)

I've learned this before but it was awesome seeing you do it without being in a movie/film we know The Bleep. ~ However, I hate saying this, but I made at least 3 videos about KZfaq about when I click on "ALL NOTIFICATIONS" on many channels some stay, but on so many channels it keeps saying "OCCASIONAL." ~ I saved the picture for this video, saved all the description and links, sharing it on social media. - (LOVE)

It's amazing. Finaly i got it. A provability of locatiin an eletron and not the exact location. very well put.