Hi Sir, i teach Physics in Belgium. I've watched many of your lectures about Electomagnetic radiations, classical mechanics, waves and so on. There's one thing i'd like telling you : you're one of the greatest pedagogue i've ever seen and heared. Thanks for all.
Do they need Physics teachers in Belguim?in your University?I like to explore and teach as much as possible as in India there is no much scope or respect in Science
Dear Mr. Lewin,I´m a medical doctor from Brazil who loves and studies physics ( every single day ) and your lectures ( all of them ) made me feel that I'm on the right way. World would be a very very different place to live if it was full of men like you...Thanks for everything....we love you!
Oh my god! I'm also a medical doctor.. well, not yet (I'm in my last undergraduate semester).. but I've been in love with Physics and Cosmology since I was a kid... I've been reading and watching lectures and videos about both topics since I was in junior high school. I actually think about getting on the right path, pursuing my true passion, studying Physics and Cosmology on a more professional level. Anyways, I love to see that there's a medical expert that has interest in Physics, because I think you already know that this is a really rare thing, lol. Cheers from Syria!
Also Medical doctor from Myanmar, South-east asia country, who love Physics since high school. My tuition teacher Aung Mya Oo, also demonstrated some experiments his best in small scale. Love to see your Lecture Prof.Lewin. Hope I can meet & buy your books.
sir i am an undergraduate student from pakistan.i think physics becomes so cute if taught by great teachers like you.Thanks A lot for providing us enjoyable , thinkable readable and above all lovely physics.
Dear Mr. Walter I'm from Vanuatu..I really love your lectures it makes me feel interested in physics ...your illustrations about the equations were really relevant ..
As a university psychology professor myself for 45 years, I can only stand in awe of Dr. Lewin. He is simply amazing and I thank him from the bottom of my heart for enriching my hobby of studying physics.
I Love You Sir. We are unprivileged for not getting a teachers/professors like you. As you know our country INDIA. Where student sucide for KNOWLEDGE. Please speak about Something on Indian Education System so that international educated community concerned about that. Thank You
Sir, it is the passion about the subject and about teaching it that makes your lessons shine. It is an inspiration. Thank you for sharing this with a broad audience.
I wish I had Walter Lewis as a teacher. My current teacher just reads off bullet points from a PowerPoint and prints off practice questions from the internet.
Logan, Many teachers in the world work exclusively with powerpoint. They eve show derivations in power point. It's very very very sad. Students only benefit from lectures if the teacher derives the derivations on the black board. Power point is basically "showing" the students what's in their books. No need to go to lectures. very poor teaching!
Sir Lewin, is a great Physicist and MIT Professor, I love the way he teaches and demonstrates.I agree with you as many teachers, just use power point via laptop and never do any derivations or equations or numerical. I do teaching Physics and I always solve or derive every relations to prove how the concept and knowledge has been used in Physics and how they are inter related I have worked at NIO, Goa India for 7 years as Research Scientist.I always use marker pen and keep solving equations just the way you do using chalkRegards
I have been a fan of Feynman since high school but his lectures couldn’t come close to explaining what Professor Lewin does here. Simple and bulletproof!! Watching this version added another nugget of knowledge that just by confining an electron to a hydrogen atom, it moves at very high speeds and has energy.
JEE Aspirant here, Gearing up for the JEE MAINS 2021. Learning this all under the age of 18 just puts me to flex a bit on people with that ages. LOL, have fun :)
its was extremely interesting way to teach the uncertainty principle, i find it lovely, normally you have to focus on some thing but this, what i found is developing your focus, you dont need to force your self. thank you professor
Tremendous work sir ,now currently i am pursuing my undergratuate .I am a great fan of your teaching .I have been watching your lectures since my high school days .Great works and you stand as a perfect example as how a teacher should be !
when i was in high school ,i use to say what a damn subject is physics ,one of the lecturers of mine in pre university told about u sir, then i started to view ur lecturing on physics, today i am able to answer every thing practically ,and iam inspiring many other people about physics ,thank u very much ,a love from india and india need lecturer like u sir.
You are lovable in India too . I wish , I wish even at this age to go back to pre university level to have a professor like you . God bless America for having a genius like you .
Professor Lewin, greetings from Serbia. You are wizard! Why I didn't have physics teacher like you are? :(. Physics isn't math, physics is nature. Physics isn't for physicists, its for all people! Thank you a lot! This is magic!
Sir the influence your lectures are having on those who are deeply curious about the world is beyond words. Your lectures, and the fact that you have made them available on youtube is a legacy and will have served to make a dent in the universe. Huge respect sir!
Sir, just to give an example of how good you teach, I'm in standard 9th and i can understand all of these topics without a doubt. Absolutely love you teaching style ❤️ Huge respect
You are one of the greatest professor I've ever seen to my life. Your lectures has motivated me alot to perceive the physics in the different way from that of a common person. I feel so lucky about myself to be a part of your lecture series. Thank you very much for being so down to earth, professor Walter Lewin. Love from Nepal ❤️❤️
27:40 THANK YOU! I speak a little bit of dutch and had an ongoing dispute with my classmates over the correct pronunciation of Huygens, now I will send them this video to show I was actually correct ^^
I've always wanted to study Physics but by the time of my highschool I didn't have much knowledge about it and didn't have any mentor who could guide me what exactly Physics was.After my Highschool I had to chose commerce and that was due to lack of money and guidance. But now when I have a smartphone I can watch Pro. Walter Lewin's lectures on RU-vid. I really enjoy your lectures sir! We love you.🙏
At work and at home, I have two flat-screen monitors that are arranged side-by-side. Now, there is typically a very small gap between the two bezels of the monitor screens where they meet in the middle. Occasionally, I would notice something strange in this small aperture between the monitors: the color pattern or visible texture of the wall behind the screens would appear to be "magnified" in the tiny gap as compared to above the screens. I often wondered what this strange apparent lensing effect was caused by - maybe some "penumbra effect", I wagered. But then I watched your lecture. Now I know what I am seeing is HUP in action!! This fascinates me to no end: That this strange "lensing" of the light reflecting off the wall through the gap in my screens is no optical illusion, but a fundamental property of nature as given by HUP!
@@lecturesbywalterlewin.they9259 Not a help request - just stating that your lecture helped me to understand why something appears to be distorted as it is viewed through a small gap, from some distance away. It is quite fascinating.
Born Ernest Rutherford 30 August 1871 Brightwater, Colony of New Zealand, could not go directly to Oxford or Oxford as it was reserved for English born. He was among the first of the 'aliens' (those without a Cambridge degree) allowed to do research at the university. It was an interesting story how many hops he had to make and be well known to be an alien at reserved universities of UK. He is not English he is Kiwi, his parents were immigrants from UK.
thanks...It is good to remember and understand these principles of QM. Because eletrons have a lot to do with chem and bio ; hence, aging and sickness.....
Google/RU-vid : please do a favor to humankind and de-rank all the pop mystic pseudo explanations of quantum physics on RU-vid and put this Master Class as the Mandatory Number 1 - Must See - Absolutely Necessary video to really start understanding quantum physics . Thank you Dr. Lewin for your infinite valuable contribution to human knowledge.
OMG! This is THE FINEST lecture on QM I have ever listened to or viewed. Prof Lewin is Zeus! Having tried to get my head around QM for many years - and failed miserably - this lecture has blown away much of the fog that obscured it for me. As a student in the "University of RU-vid", why has it taken so long for me to find your lecture(s)? Keep up the good work Walt - as Bob Newhart would have called you. Maybe you can explain why the Uncertainty Principle did not prevent the use of tobacco when introduced to Europe by Sir Walter Raleigh! Question: would you be able to explain in conceptual terms why QM & GR breaks down at the singularity that existed at the moment of the Big Bang? Many thanks for a GREAT lecture!
>>> Question: would you be able to explain in conceptual terms why QM & GR breaks down at the singularity that existed at the moment of the Big Bang? Many thanks for a GREAT lecture!>>> There is not yet a theory on quantum gravity. String theory my be our best bet (in the future).
Don't tell me you're another string theorist?! Haha regardless, this being my first time watching your lectures I am already subscribed. Thank you for translating physics to laymans!
Yep the spectrum colors , quantum leap is like violin or guitar music were notes are singular and do not grow by keeping the finger attached , each state is singular and do not overlap or gets each wave a distinct note ,never as shades of color
Thank YOU Dr. Walter Lewin!!! let me try to say this... HOYawwwCHHh Kins!! yes? Huygens :) ... this was a very enjoyable Presentation!! you're still the best! thank you for your rare talents and teaching genius! .. :) ...
thank you sir .....................but sir how will i develop an amazing teaching power just like to you that i can impress everyone and makes fiziks lectures more interesting......sir please suggest me a way that i can take the the admission in MIT.
Excellent presentation, thank you !! As stated, if you were to fire single photons at the slit, one at a time, you would get a probability distribution of hits on the wall along the horizontally smeared spot that you were showing. I'm curious - Since light is a wave with an oscillation, are we sure that the release time of the individual photons in such an experiment is not dictating where the hits occur past the slit ? In other words, if you could release photons with the identical initial phase, would they group together in one spot on the wall past the slit ? Basically a problem of asynchronous timing between the oscillation of the photon, and the moment of interaction with the slit.
read up on the web on diffraction gratings. Keep in mind that any Newtonian attempt to understand the behavior of photons will fail. Watch Feynman's lecture on the double slit demo with electrons.
I really like your lectures. Very well put together, with a bit of humour. I have one or two questions about the diffraction single slit experiment. Is it possible that the smaller the slit results in more photons interacting with atoms/electrons that make up the sides of the slit, than when it is larger? Which could result in the diffraction pattern. This interaction would be random depending on where electrons are in their orbit. Are the photons actually changing their momentum. After all the photons are originally going in a straight line, but end up going at an angle. In order for that to happen some force must have been applied. What other experiments have been done that support the uncertainty principle? Has anyone measured the deflection in the material making up the slit? In theory perhaps as the slit gets smaller the deflection increases. This would be an indication of an interaction between the material and the photons. More deflection = more interactions.
The Planck constant defines spin of elemental particles which is the same as vibrational rate in metaphysics that allows to make objects invisible ("move to another dimension").
This is the finest explaination of Heisenberg's Uncertainity principle. I am really curious to find out how did Heisenberg actually derived this formulation? Can you please give us pointers to reading material in this regard or best thing would be if you can derive the equation for us. Much respect.
Guru ( my head keeps on your feet ) 1) Can it assume as diffraction because when light is passing through narrow slit this can bend through two edges of slit ? 2)can we predict the changing of momentum of laser light keeping a screen on it. (Like zinc sulphate of rutherford experiment).in that case light can be able to see like billarad ball in triangle.
love you sir i can finally understand what will be happening in this ..... but i did not understand the experiment that's was perform by you in the last.
Sorry to bother you again. The expression for angle θ (Lecture 34, Fall 1999) after substitution of variables, depends only on the ratio of wavelength and slit opening (Planck constant cancels out). Is it not little strange that the final calculation is independent of the value of the Planck constant? One could do the experiment with longer wavelength (won't be visible and hence less exciting!) and increased slit opening, right? Best regards
It's not strange that h does not enter into my results. I have treated here light as waves. Once you do that, you "bypass" Planck. Photons (EM radiation in general) are bizarre. To say that they are waves is incomplete, to say that they are particles is also incomplete. To say that they are both is also incomplete. The rules for EM radiation are fundamentally different from our Newtonian way of thinking. ANY picture that we paint in our heads is wrong. Its behavior is crazy but it's the way the world ticks"
Yes, I see you bring in deBroglie and I suspect that now we have wave viewpoint for the LHS and particle viewpoint for the RHS of the equation. Thank you so much for your kindness answering my questions. Best regards
