The basic physics of a black hole, the Schwarzschild radius, energy, temperature, mass and entropy and Hawking radiation
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@DrPhysicsA11 жыл бұрын
My full title is Dr Robert Eagle CBE BSc PhD. I studied at Kings College London, BSc Physics and PhD Nuclear Physics. And if I can do it, then so can you. All good wishes for your continuing studies and for the future.
@siciidyaasiin85006 жыл бұрын
Thank you teacher I would like to teach me more
@mikew1990hello6 жыл бұрын
When did you complete your BSc and PhD? And what was the topic of your Phd thesis if you don't mind me asking? Not that you'll respond but I'll be grateful if you do as I'm quite curious
@SuperBking13406 жыл бұрын
How do you get away with this shit?
@SuperBking13406 жыл бұрын
Where the fuck do you get this "gravitational constant" from? Not Cavendish for fucks sake? That the best you can do?
@8BitThoughts5 жыл бұрын
Watching your videos legit makes me want to go back to university to study physics.
@veganwolf32688 жыл бұрын
The world's best physics teacher right here!
@LOLJust4YouLeader6 жыл бұрын
Vegan Wolf i guess hawking tells him everything
@-Retired-5 жыл бұрын
100% accurate!!
@vispieengineer5 жыл бұрын
I agree
@ezrahanz68964 жыл бұрын
Osuperb lecture made clear and understandable
@petermiller7413 жыл бұрын
Learned from feynmann
@RicardoPestana8 жыл бұрын
Now we need an advanced video about black holes.
@hypercoder65777 жыл бұрын
Yes please!!
@locngoduy15717 жыл бұрын
Azathoth Yes!
@sathwikreddy48817 жыл бұрын
ya boi scarce here Jn
@samarthsai95306 жыл бұрын
Azathoth For advanced lecture, watch Leonard Susskind.
@williamspenson78683 жыл бұрын
Your videos are simply amazing. I have nothing to do with this type of physics, I'm a petroleum engineer (so more like fluid dynamics and things), but I am very interested in relativity and quantum and particle physics. It all comes from my love to cosmology and craving for answers. I feel my life is wasted. Started studying systematically on my own and bumped into your videos. Fell in love immediately. You explain so well. Keep up the good work! Thinking about changing career, despite I like petroleum eng. I couldn't financially support one more degree at 25, but have been thinking about astrophotography. Thanks
@rainasajid66782 жыл бұрын
Best of luck!
@snirest Жыл бұрын
Don’t waste your life 🧑🏼🚀
@Calboyoo9 жыл бұрын
Just finished my A-level physics exams, your videos were a great help, thanks a lot !
@DrPhysicsA9 жыл бұрын
Calboyoo Thanks. I hope you get the results you need.
@simoncartier27529 жыл бұрын
DrPhysicsA Why when I read about Hawkings radiation I only find that positive particles escape, couldn't it be balanced by the opposite, negative particles escaping and the black hole gaining mass ?
@MahaKaaal0096 жыл бұрын
+John Snow actually when the antiparticle - particle pairs create up in the vaccum of space then somehow the antimatter get some negative kind of energy its not negative i mean its sign is negative as we know that if the force is negative this means its attractive. Maybe like this the antimatter falls not the particle. But again one question again arise why the antimatter only gets negative kind of energy not the matter in this case i also. Dont know.
@TheBlundert4ker8 жыл бұрын
I actually prepared myself a cup of tea before watching the video, wouldn't you know.
@MrAlexanderLang8 жыл бұрын
+TheBlundert4ker A bloody teacup didn't last, and so by the time video ended, i drank the entire teapot.
@user-sj2vg8hb5q6 жыл бұрын
I read the following comment about Stephen Hawkings passing in a muslim community: "SubhanAllah ... Alhamdulillah ... I am elated for Utz Abdul Rahman to give his khutbah on Steven Hawking. He was the frightening figure to me but who was an examplary figure to my husband. I used to hear about him for many years during our married years. When someone whom you are married to admitted that he is an Atheist the whole world that I used to know seemed lost & crumbled. I have to battle with this mountain of a man bringing up my two children alone as a Muslim in a predominantly a non-Muslim country. Even writing this brought tears of sadness to the forefront ... how I struggled through with my life and Alhamdulillah I made good choices and considered myself to be successful in Islam. Even as recently as last year my two sons said, Must be tough for you mum to bring us up but we love you Mum!!! " 😢💞 Alhamdulillah ... I am so glad that Steven Hawking is dead! May Allah Protect All Muslims not to stray from the straight path to the hereafter ... Aameen Ya Rabb JazakAllahu Khairan Kathira Utz Abdul Rahman I heard two days ago that a sister has been murdered and Islamoebia is on the increase in United Kingdom... MaasyaAllah." What's your take on this?
@antasena12196 жыл бұрын
Ehhh i drank 2 glass black coffe lol
@astronomysingh41715 жыл бұрын
AFTER SEEING THIS,YOU MUST DRINK FULL POT OF TEA!!!!
@generalesdeath72634 жыл бұрын
me too
@madeinindia77655 жыл бұрын
every time I have a doubt in physics and I see you have a video on that topic I suddenly have a sense of comfort who else agrees?
@mathsandphysicsbyifeanyi4 жыл бұрын
One of the finest teachers of physics.You are good Doc.
@ramsesll28414 жыл бұрын
THE BEST IN THE WORLD....YOU ARE MY INSPIRATION❤️
@bigrockets4 жыл бұрын
best description on black holes I've ever heard and beats everything I've read about them so far! Thank you for taking the time to go into this as throughly as you did here!
@Alex_Khouri8 жыл бұрын
Fantastic video!! Thank you do much for creating these; I'm sure it's very time-consuming, and you can see a lot of work goes into them, so it's truly great of you to do it :)
@n1cxz11 жыл бұрын
I sincerely appreciate the accuracy and detail in each of your videos. You are able to convey a grand amount of pertinent information in very little time. Through conceptual ideas and examples you are able to explain complex theories in physics (and other subjects) very effectively. I wanted to let you know that your attention to detail and effort does not go unnoticed :) Thanks a bunch! Merry Xmas!
@jidupsahu69909 жыл бұрын
wonderful explanation... thank you..
@sirandoost11 жыл бұрын
I just wanted to thank you for your great lecture. I really just clicked on your clip just to see what the clip is about and I found myself listening to your entire lecture. You truly explained the theories in a very interesting and simple way! Thank you! Can't wait to see the other clips!
@crewe998 жыл бұрын
Very well explained and written and calculated! Many thanks. It always helps to digest the information by writing it down in (as) simple physics as possible!
@fabianruiz54267 жыл бұрын
The Alice and Bob example was greeeeeeaaat!!! Congratulations.
@kernel8311 жыл бұрын
Simply AWESOME! I've been looking for an explanation to Bekenstein formula for MONTHS, in order to understand the Holographic Principle. THANKS A LOT, you made it so simple, you are amazing. Greetings from Argentina! :D :D
@peteschupp45454 жыл бұрын
This is extremly well and simple explained. Thank you
@jsl2099 жыл бұрын
Hey Doc, these videos are fantastic and I love the contributions you've made to the community.
@BeadleSci6 жыл бұрын
This has been by far the best explanation I have ever heard! Thank-you so much!
@parthchopra28117 жыл бұрын
Sir...this is possibly the best explanation i hv ever seen in my life..the u hv put up the freaking mathematics and the way u hv merged it wid the cosmos,i believe that u truly deserve at least a compliment...keep it up😄
@carolsmith97287 жыл бұрын
I love the way that you simplify this information, so that anyone with a basic understanding of Algebra can understand, what otherwise, seems so complicated. I honestly feel like watching your videos has raised my IQ! Ty so much!!!
@DrPhysicsA7 жыл бұрын
Many thanks. Kind of you to say so.
@haneen9928 жыл бұрын
I'm yet to see someone explaining such complex subjects with such clarity. Great job!!
@no_more_free_nicks6 жыл бұрын
I absolutely love your videos, nothing can replace knowledge, some math, and good old fashioned piece of paper and a pen.
@ShermanSitter4 жыл бұрын
This is amazing! So interesting. Gave me a break from studying quantum mechanics which is blowing my mind.
@randallstephens9599 жыл бұрын
Wait. Is this channel real!?! I love you, Dr. Physics! Thanks for what you're doing!
@aslaans.56546 жыл бұрын
Thank you for this concise, clear explanation of black holes; you managed to first introduce new concepts and THEN apply it to the physics of a black hole, which helped me understand those processes. Wonderful video!
@nunoterceiro10 жыл бұрын
Very fun and precise lecture! Thanks for the vid and keep up the great work!
@tor13028 жыл бұрын
best physics vids on youtube!
@AliHSyed5 жыл бұрын
In celebration of the first image of a black hole, I'm gonna watch this.
@StaticBlaster4 жыл бұрын
Thank you for this invaluable information. I need to re-watch this to really pound it into my brain. I'm not going to school to be a physicist but physics itself has always fascinated me and I've taken the red pill ever since grade school.
@elifonkonsolakis25219 жыл бұрын
Thank you dr Physics, for your neat explanation and for introducing me to dr. Susskind whose whimsical teaching is so complementary to yours
@ostihpem9 жыл бұрын
Just for understanding: So if something falls into a black hole, it increases the mass of the black hole and therefore the schwarzschild radius?
@DrPhysicsA9 жыл бұрын
Yes. Unless its associated with the process called Hawking Radiation (in which case it reduces the mass of the black hole).
@DinarAndFriends6 жыл бұрын
How would the mass be 'associated with...Hawking Radiation'? What does 'associated mean' in this context? 'Hawking Radiation' is a hypothetical black body radiation based on zero experimental evidence. It has nothing to do with masses falling into 'black holes'.
@MahaKaaal0096 жыл бұрын
+DrPhysicsA why the entropy of photon is 1 not any other number and explain me how come the entropy of photon is one?
@deltaexplorer478 жыл бұрын
Hi, I do not hold a degree in science; however, listening to your class was so clear and interesting. Thank you very much.
@elevate077 жыл бұрын
I genuinely wish I had the intelligence and skill to come to these conclusions myself. I know the general rules behind Black Holes but to see the math representing it explained makes me genuinely want to get in this field. I'm glad I discovered your channel and not only did I subscribe but now I'm making a genuine effort to get better at math.
@The_man_himself_673 жыл бұрын
Bob Eagles: what a phenomenon! Who else could explain complex physics with a felt tip pen and a roll of paper? Quite extraordinary. Thanks Bob.
@bashkillszombies9 жыл бұрын
I found one of these down the end of my back yard. I came online to try and learn more about them. I kept throwing the garden clippings and raked leaves in it for the last few weeks, will that be a problem? Does anyone know how to get rid of one? I've lost two cats to it and three cricket balls. It's starting to become a bit of a pain in the arse. I think maybe it was my neighbor; finally had one too many McFat burgers and imploded into a singularity.
@user-hi4sm3ig5j8 жыл бұрын
Wait, what's velocity again?
@1945joshuaruiz8 жыл бұрын
The speed of an object in a given direction
@user-hi4sm3ig5j8 жыл бұрын
***** Yes. It was my rubbish sense of humour. Sorry.
@1945joshuaruiz8 жыл бұрын
iM3GTR haha sorry for not catching on!
@omkhard18335 жыл бұрын
He had drawn opossite axis (distance and time) that's why slope had become opossite and small slope Will attain high velocity!
@marcusdurand53874 жыл бұрын
@@1945joshuaruiz smh
@alvarogarciazamarriego4889 жыл бұрын
You're such a genius. Thank's a lot for all your videos; I have only seen a few but they're fantastic
@akbarrahmatullah67015 жыл бұрын
What a simple consise logical approach to a complex concept. Well done.
@princeistalri79449 жыл бұрын
A delightfully clear and fascinating video as always, DrPhysicsA never disappoints ^_^ Just out of curiosity, do you think it could be theoretically possible to some day work out so clever a formula that the infinities would cease to be a problem and we could obtain more detailed information? I ask at least partially because I am vaguely aware that similar issues occur when trying to reconcile relativity and quantum mechanics, and wouldn't be too terribly disappointed if such problems were solved within our lifetimes. Please forgive any obvious face-palm worthy facts I may have overlooked, I'm just watching these videos out of curiosity after a month or two out of the game.
@phillipcharlesashwood18509 жыл бұрын
pupil; metaphore .. steven hawkings and the end of Alien 4 .. And I write that with due respect to Steven Hawking .. In his mind .. the escaping particles are thoughts .. how we speak with our eyes ..
@princeistalri79449 жыл бұрын
Phillip, Charles Ashwood-Cann It's "Stephen Hawking", and science fiction films have nothing to do with him. Escaping particles are not thoughts, my friend. Where are you getting this ridiculous information?
@obiwan0429 жыл бұрын
Prince Istalri There are some coordinate systems and other geometries that allow for infinite to be conceptualized, however I suspect that they do not fit the paradigm that you are looking for. Hyperbolic function are drawn on a circular graph, the boundaries of which are representative of infinity. A curved line on a hyperbolic graph, is actually a line in cartesian 2-space and is made to intersect the boundary at a right angle, meaning that it tends to infinity. Although this allows infinity to be placed at a distinct point in space, the scaling on the line becomes gradually smaller approaching zero as the limiting value as the visual distance away from the boundary also approaches zero. This does still leave a problem with infinitesimal values but the point, after the dilated discussion, is that infinity may be beyond our conceptual boundary, but it can still be talked about and, to a greater or lesser degree, be understood! :)
@princeistalri79449 жыл бұрын
obiwan042 Thanks ^_^ Infinity is intriguing, but seems to be one of those things that "breaks math", so to speak. The best we can do is sneak up on it using limits or infinitesimals; it's nature in certain scenarios can be discerned with these techniques, but you can't actually get to it and directly work with it, which is something I've always found oddly fascinating. Perhaps the next Euler or Gauss will be able to formulate a way to work with infinity, but for now, I guess we just have to deal with the limited understanding of it we can obtain.
@dbanetinc9 жыл бұрын
Prince Istalri wtf breaks math? What exactly are you talking about?
@mdtsinha9 жыл бұрын
DrPhysicsA - In the Alice and Bob explanation, you kind of tricked us there. In the example, Bob always sees Alice as slowly approaching a point, but Alice has no problem in seeing Bob, i.e. The Accelerating person has a perception of the constant velocity person as getting slower. When you moved towards the Black Hole counterpart, you reversed it by saying that the person who is observing from outside sees the person in the Spaceship getting slower and slower. Shouldn't it be the opposite? Shouldn't the person in the spaceship (like Bob) see the outside observer (like Alice) getting slower as the spaceship approaches the Black Hole, but the outside observer has no problem in seeing the Spaceship enter the Black hole and eventually get destroyed? Isn't it?
@yugojyotimuna23839 жыл бұрын
Yeah he got that wrong
@rudolfk40708 жыл бұрын
Mudit Sinha no, he got that right bc the gravitation makes bob (spaceship) to increase his speed by pulling him towards the center of the black hole, so his speed is increasing so it's like the diagram he showed us before
@urkosh5 жыл бұрын
what is that point Alice (from Bob's perspective never) crosses, and after which she is not visible to Bob? What is that crossing? It seems totally irrelevant. What is it?
@Hunar19975 жыл бұрын
I'm still confused :( first Bob is fast and sees the slow person go slower .. then Bob is fast near the black hole but the slow person sees bob get slower :(
@robinswamidasan5 жыл бұрын
@@yugojyotimuna2383 and Mudit Sinha : Yes, the analogy with Alice and Bob cannot be made directly to the Black Hole scenario, because the the presence of the BH distorts space-time. i.e. the Euclidean / rectangular co-ordinate grid of Alice-Bob cannot be used. A Penrose diagram is used instead. See : kzfaq.info/get/bejne/o86kYJSUmd3HYIU.html for a lay introduction. But, it is still true that Time for the victim accelerating towards the BH moves slower and slower RELATIVE to the observer's Time. In effect, the observer never sees the victim cross the Schwarschild radius / Event Horizon.
@mbackmsn15103 жыл бұрын
I couldn’t understand this with out knowing general relativity. So lucky this guy has great videos on litterally everything.
@Kanibulus8 жыл бұрын
this video is really good because you explain it so well anybody can understand, hope there were more teachers like you
@IZAAAAAAAAAAAAAAAR8 жыл бұрын
"As long as you're here, you musn't be there" XD
@steve257827 жыл бұрын
You're talking about advanced concepts, but you're making what we MIT graduates consider freshman-level mistakes: 1. Confusing definite and indefinite integrals; 2. Using formulas outside the ranges in which these formulas are valid; and 3. Confusing arbitrary choices of scale with real physical phenomena. Your reasoning then elaborates these errors into absurdity, which you don't recognize because black holes really are weird. The force of earth's gravity decreases inside the earth, falling to zero at the earth's center. The formula for gravity isn't valid for r less than the radius of the earth. Potential energy from earth's gravity is only zero at the center of the earth; it's positive everywhere else and has a finite, positive maxium at infinity. (A light-year is close enough to infinity to be infinity for almost all practical purposes.) The gravitational potential energy of a mass on the surface of the earth is something large and positive, maybe over half of its potential energy at infinity. The formula for the sun's gravity is invalid for values of r less than the radius of the sun. You take formulas that are only valid for r values greater than thousands of miles and then draw conclusions from them as r goes to zero. That's nonsense. If the truth is more complicated then talk to a real physicist and make things more complicated. Your errors make me not trust anything you say
@EugeneOneguine3 жыл бұрын
Not only that, but his transition from the graphic explanation of Alice and Bob to the point about black holes doesn't make sense. If you take up the graph, the light from Bob does reach Alice. So it would mean that Alice can see Bob crashing into the black hole. But she doesn't, because the physical properties of the black hole doesn't let light travel out of the swartzschild radius. The graph doesn't illustrate the point at 40:20 at all, it serves no purpose in this video. After trying to demonstrate it myself to friends, I realized that the point made with the graphs doesn't make any sense when talking about someone who entered the radius of a black hole. I'm quite disappointed...
@lorewalkerswarcraft50694 жыл бұрын
Great content, Very intuitive and easy to follow. Thank you for your effort.
@lu_anholt11 жыл бұрын
I must say you seem to be a natural at teaching! I can't thank you enough!
@Bingbangboompowwham4 жыл бұрын
Decided that a bucket list accomplishment of mine will be to understand the math of black holes, so here I am.
@johnmontgomery56010 жыл бұрын
A fantastic video. I like the way you work through numerical examples.
@caudaypokharkar47524 жыл бұрын
Best teacher to explain cosmology
@hqs95855 жыл бұрын
Amazing simplification of a rather cumbersome subject, congrats!
@Lombey849 жыл бұрын
Thanks a lot for taking the time of making this videos, they are very interesting and helpful.
@CursusMoribus11 жыл бұрын
I am so happy I found this channel. Thank you!
@perryjalinoussi172311 жыл бұрын
Your lectures are absolutely GREAT! Thank you!
@mattroom4 жыл бұрын
You are an absolutely amazing human being for sharing this with the world
@davidbipin94643 жыл бұрын
The reason you got hyped sometimes while briefing, I couldn't escape your video.
@acarvey7 жыл бұрын
You are an amazing educator. Thank you for your videos.
@thxdts199910 жыл бұрын
Thanks for the lessons and work please continue.
@KritikX3 жыл бұрын
Very interesting. Thanks for this lesson!
@moinaction7 жыл бұрын
This is what we pay tuition for and you gave it to us for free. Thanks for what you do. We appreciate your time.
@asully30067 жыл бұрын
BRAVO! bravo! very, very well explained with such degree and elegance!
@TIMEwaitsFORnoSLAVE11 жыл бұрын
This has helped me no end with my physics coursework, which is on black holes. Thankyou for this video
@kshitijgera54757 жыл бұрын
you made me love with physics(cosmology). Thanx..
@f.p.11316 жыл бұрын
extraordinary demonstration! great teacher! congratulation! thank you !!!!
@eofjjeifj4z389734989 жыл бұрын
Wonderful!!!,that really expand my knowledge about black holes...
@michalisstathakopoulos11666 жыл бұрын
Simply a wonderful video teaching difficult stuff at the right level, especially for those who understand basic school physics but they don't have the right background for specialization and research at theoretical physics!
@OMGWTFBBQ109011 жыл бұрын
A very good video that explains the basic concepts and maths behind those concepts, of black holes, it has given me a better insight into other videos and information on the subject. very much worth watching if you want a bit more information about black holes without need a degree on the subject to understand it. Many thanks for making and uploading it free to view!
@MrErneyj11 жыл бұрын
THANKS A LOT. This is wonderful explanation of what a black hole is.
@ronaldmayland79154 жыл бұрын
I always taught Black hole mathematics could only be understood by a prodigy. You simplified iT so even highschool students can understand. Thank you Robert
@benyounesm6 жыл бұрын
The best explanation of black holes ever
@merpk20084 жыл бұрын
sir, you r the best teacher i ever attended, simply ur explanation is wonderful, after watching your video im fascinated in physics .
@saurabhCherished11 жыл бұрын
Great lectures! Glued me to my chair for whole night.Thank you very much.
@voodootech84249 жыл бұрын
Very clear introduction! Great work!
@Maricavdven9 жыл бұрын
Thank you for this wonderful explanation.
@wikingandersson25614 жыл бұрын
Wow! Thank you so very much for this!
@rayfranco12565 жыл бұрын
Outstanding explanation of multiple topics.
@sudipeinstein8 жыл бұрын
wonderfull and simplicist explanations...thnx for understanding
@tomjones91375 жыл бұрын
Great videos my friend, you are a natural teacher
@SimplisticVR2 жыл бұрын
Just finished the whole thing, great video!
@beowulfkhan17967 жыл бұрын
Thanks you are the best physics master who explained black hole i simple words i once again thank you and salute you.
@marcelweier18067 жыл бұрын
Thank you for your effort to bring physics to the people. i have to check out your quantum physics videos......you got a new sub
@peterkay74587 жыл бұрын
Beautiful explanation...thank you Dr. Physics
@mamtajha65646 жыл бұрын
Wonderful. ..explanation from basic to high level
@DrPhysicsA11 жыл бұрын
Thanks. You raise a good point. Of course, you can never see the black hole as such, you just see all the material that is falling into it appearing to approach the black hole at ever slower velocities. Since it is in fact accelerating toward the BH (and thus away from the observer) and at high speed it would be substantially red shifted.
@tubelator9 жыл бұрын
Man you are good! I watched the first 18mins and I understand singularity! And I even dont know my tables anymore :) Great lesson!
@spacefed6411 жыл бұрын
you are explaining it perfectly...thank you very much ... you are very talented in explaining things very simple...
@AtmosMr8 ай бұрын
❤ thank you so much for these wonderful videos. The pen is indeed mighty!
@aryamankelkar59362 жыл бұрын
Thank you so much your explanation were as clear as day ,and I hope that everyone reading this a very enjoyable pun(I asked my friend why he likes reading books about black holes. he said “because they are timeless”.)
@SKCSK79210 жыл бұрын
Awesome Lecture , I thoroughly enjoyed every part of it ! Cheers :)
@chapinero01711 жыл бұрын
wow this is so cool!!! learning nowadays is more easy than ever!!! no excuses..
@rktiwa3 жыл бұрын
Now I can guess but as I said years ago you are the best. I feel honoured that once you answered my question some 7-8 years back. Your versatility might have brought you everything that you could have wished for it has lost us you. Best wishes.
@nadenitza5 жыл бұрын
Great explanations, thanks for the information
@sandeepbolla6 жыл бұрын
Sir , Best video i have ever seen about these black holes and stuff I did not understand this concept when i read about this in a book H.C VERMA.But u explained it very clearly..Thank u sir once again
@lucasa.82238 жыл бұрын
you have an extraordinary talent for teaching. very impressive.
@DrPhysicsA11 жыл бұрын
Thank you. And greetings from the UK.
@DrPhysicsA11 жыл бұрын
Nothing escapes from a black hole once it has been trapped (leaving aside the Hawking radiation effect). But the black hole may form something along the lines of an accretion disk by drawing material from a nearby object (eg close orbiting star). It is the effect on that material (which is not yet absorbed into the black hole) that gives rise to the various emissions.
@lennydoyle73823 жыл бұрын
Dr. Robert great video. Can't wait to watch 'Einstein Field Equations- for beginners'.
@Fearless1547 жыл бұрын
Great video. Thank you very much.
@WildGamez3 жыл бұрын
Makes concepts easy to follow. Better than many so-called intellectuals.