I think he’s a professor at Nottingham University. Brady, who is behind the Periodic Videos channel also has a channel on physics and you can see this guy explaining stuff (same voice)
@@AkamiChannel this isn't the same guy you're thinking of. This guy's name is Bob Eagle. He's not a professor. He's actually a radio host, singer, contributor to the field of physics. Just a jack of all trades, really. He just happens to sound a lot like Dr Mike.
@@heavennoes he does. But he's not a professor. He is more like Brian Mays (I think that's his name) from queen. He has a PhD and has published papers, etc. But has pursued several different career opportunities outside of physics.
I have been utilizing this channel for many months now in an attempt to better understand the universe around me and I HAVE to say that is the greatest source of information i have ever encountered in regards to truly understand the formalism behind the some of greatest milestones in physics. Im eternally grateful. Thank you.
I agree with you. I'm doing the same. It's a cool feeling when you puzzle a concept out for a while and suddenly it clicks and you all of a sudden "get it." Since I was a little kid I have questioned everything. No explanation was every really good enough lol. It's amazing watching these videos and actually getting a pretty good understanding of the fundamentals of reality INSTEAD of the pretty poor dumbed down explanations one usually gets.
Well.. That just changed my life. Just had a nice history lesson from Ernest Rutherford -> Albert Einstein -> Max Planck -> De Broglie -> Werner Heisenberg -> William Hamilton -> Joseph Fourier -> Charles Hermite -> Erwin Schrodinger! Beautiful! I'm so grateful for you sharing this.
I'm really just trying to illustrate the principles here without getting too bogged down in the maths. You could argue that we are talking about a particle having a particular value of K such that K is zero for all values apart from the specific value associated with the particle.
Clearly, one of the best lectures on Particle Physics. Before taking a course on physics, it is best to start here to get the foundations right. Thanks, DrPhysicsA
Admittedly, I only completed high school and am now a middle-aged man here in the US and am familiar with basic math but I find learning about physics topics very interesting. This is the third video of yours I’ve watched so far and for me you explain these things very very well and I like that you write it all out and say it in plain terms. Wikipedia helps me a lot. Thanks for making these videos and I’m glad to be a new subscriber of yours in February 2019.
Very strange. I was watching a video on CZcams in bed. I eventually fell asleep & I guess when the video I was watching ended it somehow went into this one. I awoke in the early hours of the morning 45 minutes into part 2. I had a good couple of hours dream time physics lessons! Even stranger is that I remember the dream comprising entirely of this video's audio. The dream was visualized by a series of parallel washing lines running criss-cross. The washing lines were in rows of 10 & along each line ran a colored square (about 10 cm's across) that represented numbers & moved along in such a way as to illustrate calculations. Weirdest fucking dream I've had a for a long time!! Before going to bed I'd just completed a bottle of red wine. I went for a little lie down as I was feeling a bit worse for ware. 2 hours later I awoke from my dream completely & utterly perplexed but now with a firm grasp of particle physics. Amazing. I wonder what I will dream about tonight?!
well i think a better way is after you gaduate you take courses in advanced mathmatics and modern mathmatical theorems it can really help you put your thoughts in equasions
DrPhysicsA I agree. My story is weird. I loved physics and architecture - like to draw and resolve. I encountered relativity and said I will never understand it intuitively. I explored the macro to micro sciences with analogies. Then in architecture I heard it for the first time - get outside the box - get uncomfortable - be aware of what you are dealing with. Suddenly the world was full of mystery and we have the power to look for the clues. I carried on with architecture, but that's when I realized that a rotating wave made up the electron (fermion) and explained relativity, etc inherently. Not de Broglie's pilot wave, but matter itself was a manifestation of the rotating wave. I'm a private entrepreneur and proud of it, but I will try to learn everything I can while I'm here. Going over these lectures is a great privilege. One must know the laws in detail in order to ask the right questions. Thanks so much. Bill Christie
I cant thank you enough for these videos...they are really the best on youtube in the way you explain things.... hope you are doing okay and looking forward to new videos
This is just great! I'm a computer programmer and my math background is just introductory calculus (and that was a long time ago) but all of this stuff is still very easy to follow. I always wanted to have more detail, see a little more math behind the ideas presented by physicists in popular science talks and this stuff fits the bill perfectly. Thank you so much and please keep up the great work!
Thank you so much DrPhysics. This is an amazing representation for some one like me [Who has an interest in GUT and particle physics, and general physics to boot] I have never had any opportunity to study this type of thing , so I do so in my own time.[ I dropped out of school thinking it wasnt getting me anywhere] now im 33 and have a keen interest on these topics. People like you help people like me realise thier dreams [and kick themselves for not pursuing university studies, when the opportunity was there]. If any one knows of some where online I can study/ learn particle physics [with a bit more detail, and at a pace I can work through] I would be very appreciative. Again DrPhysics the time and effort you have put into this video [first one of yours i found/ am yet to get to the others] is phenomenal. I really appreciate it
Great job man ! This is your first video that I am watching but guess I should get back to the QUANTUM MECHANICS ONCEPTS first. But really apreciate your efforts as I am a massive physics enthusiast. Keep up the good work, it is the efforts of passionate people like you that keep us physics enthusiasts' curiosity alive and breathing !!!
most definitely. I don't see why it has to be so complicated. Any concept can be made easier taught. Most people put up a hissy fuss when this is pointed out because usually they're not incentivized to put in the effort to research and refine their presentation. They can afford to put the onus on the student/customer citing laziness, shame, and ego. Those that do and can grasp it via the less intelligible way, don't complain, and in fact boast about it because it becomes a differentiating factor, they can hold it over others, and it's the accepted social climate aligned with the authority figure's preferences. I say fuck that I'll compete teach better, and reward those who do the same in the free market.
gwho You are absolutely right about this. In fact, the situation is worse. Many science academics deliberately treat their subjects as repositories of holy writ to which they have been admitted but which must not admit others. They conceive their job as gatekeepers rather than popularizers , as if passing knowledge on will in some way lessen their own kudos. Typically, they try to mystify the material as much as possibl and talk in impenetrable jargon to help them do this, so we all know who's playing that game. These people should be flagged up, denounced and disincentivized ASAP. And all praise to guys like DrPhysics for going the exact opposite. He is a great teacher, with all the right instincts and a very amicable manner. If anyone should get an OBE it's him.
intentionally obfuscate it, or refuse to teach it simpler, supposedly to filter people out. I mean, i get the Flynn effect is there too, but it's not the only way.
This series is a prime of didactics and deepness, for the advanced concepts explained in rational sequence. I shared this video on facebook with my friends ( biomedical researchers in great part ) .Best wishes from Rio.
Thank you very much, sir, for your passion in teaching these pieces of stuff! It immensely helped me in advancing my physics career and studies! Cheers!
recently had my mind blown when i learned that, strictly speaking, "particles" are not really particles as one might normally envision them and "fields" are not really fields. i still plan to educate myself via your vids, but it is a strange new world for me having learned these things. very excited to have found the "Einstein Field Equations for beginners" vid. being able to push pause at anytime in order to think carefully about what is being said will enable me to get further with physics then if i was sitting in a lecture hall. thanks for the fascinating uploads DrPhysicsA!
To whom it may concern. Because of teaching styles if you watch these videos on creation and annihilation operators and then watch professor Susskind's Stanford videos afterwards on introductory particle physics which also talks about the c and a operators they complement each other nicely. Block off 3 to 4 hours of time as i found it better to watch them both around same time.
I have studied a little of Quantum Mechanics before, but I found this video of you very good. You explain very well! I'll continue seeing this series of you and other ones too:)
hello professor. Thank you for the very lucid explanations of these concepts. Only the one who knows thoroughly can explain so easily. Einstein I think is supposed to ahve said "if the solution is very simple, god is answering". thanks sir.
Great teacher! now physics seems really different after listening and watching your lectures... thank you so much may Allah bless you and your entire life and family sir! its such remarkable work you are doing for free... it's like talking classes in Oxford university!
I was really able to absorbe the vast majority of this. There are some formulas and effects that you speed thru and/or reference, but a bit of wikiGoogle'ing has covered those gaps. I am new to your series - breadcrumbing and reverse viewing as per your references - and look forward to rekindling my youthful love of math and physics at the atomic and quantum levels. Thank you so much for all this hard work and tsking the time to articulate. I believe I would have excelled better in my early academics had I found someone to explain these topics as you have. Consuming all of your vidoes will be my goal for this season. Cheers &much respects. Dave.
Hello. Thank you very much for excellent videos! Quick question regarding the explanation at 13:24. If the cricket ball is moving at 100m/s, wouldnt the wave length be below the Planck length? And if so, wouldnt it imply that see the ball moving, so the movement which can be measured, but the wavelength is immeasurably small?
At first I though you were calling him a hat :) After a little research, I now know it's meant to say "hat's off to you with respect." I came here to learn physics and end up learning language. Chapeau!
+DrPhysicsA 57:31 - how did you conclude that psi-dagger was 'sum a+ ...' . I've watched the QM concepts vids and took notes but can't remember going over this. This stuff is far ahead of my current physics knowledge but I'm seeming to follow the vids quite well, i can do the maths I'm just not sure how you got an equation for psi-dagger and also psi(x) [the second one]. Thanks!
So... if I set up a big grating and fire cricket balls at it, they will impact a background screen with an interference pattern showing bands on the order of 6x10^-35m big? That's too small to measure, of course, but am I correct in principle?
At around 53:30 you spoke about how fields can have different wave shapes. With sound waves, we can appreciate different timbres which depend on the wave shape of the sound. Are there similarly different 'timbres' of light?
Thanks for your answer. It will take some head scratching and some books reading before I fully understant it. But I have to say, particule physic is "passionnant" (yes I'm french) especially when explained the way you do in your videos.
I do not understand the very last division by (ik)^2 at 1hr3min. How is this legal? Doesn't the ik term and the exponent fall under the leading summation over k? In which case, dividing d2psi/d2x by (ik)^2 is illegal. Can somebody explain where I have gone wrong?
how is it that you just "create" a+ and a- ? Is there any sort of logical progression from H=1/2(p+iwx)(p-iwx) to a+ and a-? Or is it sufficient to say that a+ and a- are what they are because the commutator happens to be -1 when a+ and a- are given by those equations?
At 33:40 you said the energy is borrowed for a short time even if the energy never existed, is the other way around possible? i.e. can the time be borrowed at the cost of energy?
Question for you, if there is a "virtual" photon between two electrons communicating the force between them, but photons are quantized, does that mean that the strength of electromagnetic force is also quantized? I was under the impression that it changed continuously as the distance between two charged particles changed continuously.
Hi, I have a doubt, how can u use h/p for particles like electron since in the earlier part, when you derive the equation, you used the assumption that velocity is = c for photon shdnt p =EC/V squared for a photon ?
Excuse my ignorance, but in the formula derived from E=mc2 they conlcuded that p=h/λ. that works for the photon because it moves at the speed of light (in this case c) but with an electron does it work the same? I mean the electron doesn't move at the speed of light so the isolation couldn't be made from E=mc2 right? I know there is a reasonable explanation for that but I would be really thankful if could you provide me one. Ypur videos are amazing by the way.
Thanks for the lecture! Weird that it has only garnered ~1% of likes, when most other presentations are usually at an average of 10% of likes. Must be that most people are afraid of thinking of the physical world from an analytical frame of mind or maybe they think that to "get physics" they have to get it from the "Tree of Knowledge ..."
At 1:04:25 you divided the left side for -(i omega) because it is independent of k but I think dividing the right side for (ik)^2 is not ok at all because it has the sum over k (the sigma term). Can you explain it for me?
this was a mistake -- he should have changed the k^2 -> omega*2m inside the summation sign -- then all would have worked out OK. It seemed to work in the video, but as you noticed it was an accident because you can't just take the k factor outside the summation (or the omega for that matter).
sir you have said on your particle interaction videos that w+ and w- gives off positron and neutrino not electron neutrino. does electron neutrino is same as neutrino?
What physical meaning the imaginary term isin(kx -wt) has in the expansion , e^i(kx - wt) -..........-(I)? The wave represented by (I) is a cosine wave only, right? Or the sine part has to do anything with this? I am extremely confused on what is the role of imaginary terms in waves as well as in Currents.
If the time evolution of a wave psi(x) would be written as: psi(x,t)=psi(x) cos(wt), then at certain times t the wave function would collapse completely and the particle would be gone (consider wt = pi/2, 3/2 pi, etc). Writing a wave like e^(iwt) would make sure that |psi(x,t)|^2 = |psi(x)|^2 at all times t.
@ 56:49, you replace the α(k) term with the a+(k) term in order to make it a quantum operator. But why? Is it just a "hit-and- miss"? Do we use it because it works, or is there reasoning? And by the way, awesome video!
On the last equation (33:41) you said "uncertanty in energy times the uncertainty in time must be bigger or equal to...". So which one is more accurate, the 'energy' or the 'time'?
This is the greatest "non-proffesional" lecture to particle physics I have ever seen. Great work!
Seems quite professional to me.
I think he’s a professor at Nottingham University. Brady, who is behind the Periodic Videos channel also has a channel on physics and you can see this guy explaining stuff (same voice)
@@AkamiChannel this isn't the same guy you're thinking of. This guy's name is Bob Eagle. He's not a professor. He's actually a radio host, singer, contributor to the field of physics. Just a jack of all trades, really. He just happens to sound a lot like Dr Mike.
@@Quantum- I thought he had a doctorate in nuclear physics at king college?
@@heavennoes he does. But he's not a professor. He is more like Brian Mays (I think that's his name) from queen. He has a PhD and has published papers, etc. But has pursued several different career opportunities outside of physics.
I have been utilizing this channel for many months now in an attempt to better understand the universe around me and I HAVE to say that is the greatest source of information i have ever encountered in regards to truly understand the formalism behind the some of greatest milestones in physics. Im eternally grateful. Thank you.
I agree with you. I'm doing the same. It's a cool feeling when you puzzle a concept out for a while and suddenly it clicks and you all of a sudden "get it." Since I was a little kid I have questioned everything. No explanation was every really good enough lol. It's amazing watching these videos and actually getting a pretty good understanding of the fundamentals of reality INSTEAD of the pretty poor dumbed down explanations one usually gets.
Geronimo Cornplante
agreed!
lolz
Jupiter he´s just trying to tell us how small an antifa´s brain is.
Well.. That just changed my life.
Just had a nice history lesson from
Ernest Rutherford ->
Albert Einstein ->
Max Planck ->
De Broglie ->
Werner Heisenberg ->
William Hamilton ->
Joseph Fourier ->
Charles Hermite ->
Erwin Schrodinger!
Beautiful! I'm so grateful for you sharing this.
This stuff is ridiculously simple. You're a very good teacher.
Don't shrink his head's wavelength.
I'm really just trying to illustrate the principles here without getting too bogged down in the maths. You could argue that we are talking about a particle having a particular value of K such that K is zero for all values apart from the specific value associated with the particle.
Clearly, one of the best lectures on Particle Physics. Before taking a course on physics, it is best to start here to get the foundations right. Thanks, DrPhysicsA
i wish I had a tutor like this - HE IS GOOD!!!
Aspiring high school student here. Thanks a lot for the comprehensive introduction. Will be aiming to base my career in this extraordinary field.
Admittedly, I only completed high school and am now a middle-aged man here in the US and am familiar with basic math but I find learning about physics topics very interesting. This is the third video of yours I’ve watched so far and for me you explain these things very very well and I like that you write it all out and say it in plain terms. Wikipedia helps me a lot. Thanks for making these videos and I’m glad to be a new subscriber of yours in February 2019.
And yet another EXCELLENT video. Thank you! You have a unique skill in lecturing/teaching. No wonder you've got hundreds of thousands of "views".
Very strange. I was watching a video on CZcams in bed. I eventually fell asleep & I guess when the video I was watching ended it somehow went into this one. I awoke in the early hours of the morning 45 minutes into part 2. I had a good couple of hours dream time physics lessons! Even stranger is that I remember the dream comprising entirely of this video's audio. The dream was visualized by a series of parallel washing lines running criss-cross. The washing lines were in rows of 10 & along each line ran a colored square (about 10 cm's across) that represented numbers & moved along in such a way as to illustrate calculations. Weirdest fucking dream I've had a for a long time!! Before going to bed I'd just completed a bottle of red wine. I went for a little lie down as I was feeling a bit worse for ware. 2 hours later I awoke from my dream completely & utterly perplexed but now with a firm grasp of particle physics. Amazing. I wonder what I will dream about tonight?!
Dogboy73 I
Well, as long as no-one's watching you, an interference pattern. :D
Yeah dont believe a word of that.nice story tho.maybe tonight you will dream up another fake story
Completed a bottle of wine. Really, completed. Hahahahahahahah
There is so much information on CZcams. You can literally learn anything if you want
Your pronunciation is charming! I love it !
Wonderfully concise. Barely a word wasted.
awesome. best yet. !! every dark cloud is going away and FINALLY seeing the gist of the whole matter...thanks to YOU. ..greatly appreciated.....!!
Did this at a party last week. Huge hit. Thanks.
Best route to become theoretical physicist, get initial degree and post-graduate degree and then seek a university research post.
What if we just want to learn about particle physics for fun?
Silas Panelo Sadia Like most things, the jobs are highly competitive.
Silas Panelo Sadia But I don't want to be a theoretical physicist.
well i think a better way is after you gaduate you take courses in advanced mathmatics and modern mathmatical theorems it can really help you put your thoughts in equasions
DrPhysicsA I agree. My story is weird. I loved physics and architecture - like to draw and resolve. I encountered relativity and said I will never understand it intuitively. I explored the macro to micro sciences with analogies. Then in architecture I heard it for the first time - get outside the box - get uncomfortable - be aware of what you are dealing with. Suddenly the world was full of mystery and we have the power to look for the clues. I carried on with architecture, but that's when I realized that a rotating wave made up the electron (fermion) and explained relativity, etc inherently. Not de Broglie's pilot wave, but matter itself was a manifestation of the rotating wave. I'm a private entrepreneur and proud of it, but I will try to learn everything I can while I'm here. Going over these lectures is a great privilege. One must know the laws in detail in order to ask the right questions. Thanks so much. Bill Christie
I cant thank you enough for these videos...they are really the best on youtube in the way you explain things.... hope you are doing okay and looking forward to new videos
OMG i recently found your channel and I love it! You explain everything so well.
This is just great! I'm a computer programmer and my math background is just introductory calculus (and that was a long time ago) but all of this stuff is still very easy to follow. I always wanted to have more detail, see a little more math behind the ideas presented by physicists in popular science talks and this stuff fits the bill perfectly.
Thank you so much and please keep up the great work!
Thank you so much DrPhysics. This is an amazing representation for some one like me [Who has an interest in GUT and particle physics, and general physics to boot]
I have never had any opportunity to study this type of thing , so I do so in my own time.[ I dropped out of school thinking it wasnt getting me anywhere] now im 33 and have a keen interest on these topics. People like you help people like me realise thier dreams [and kick themselves for not pursuing university studies, when the opportunity was there]. If any one knows of some where online I can study/ learn particle physics [with a bit more detail, and at a pace I can work through] I would be very appreciative.
Again DrPhysics the time and effort you have put into this video [first one of yours i found/ am yet to get to the others] is phenomenal. I really appreciate it
You are so great you made me understand quantum field theory. Amazing! Keep doing what you're doing.
Great job man !
This is your first video that I am watching but guess I should get back to the QUANTUM MECHANICS ONCEPTS first.
But really apreciate your efforts as I am a massive physics enthusiast.
Keep up the good work, it is the efforts of passionate people like you that keep us physics enthusiasts' curiosity alive and breathing !!!
your lectures are simpler than leonard susskinds lectures great job Sir
most definitely. I don't see why it has to be so complicated. Any concept can be made easier taught. Most people put up a hissy fuss when this is pointed out because usually they're not incentivized to put in the effort to research and refine their presentation. They can afford to put the onus on the student/customer citing laziness, shame, and ego. Those that do and can grasp it via the less intelligible way, don't complain, and in fact boast about it because it becomes a differentiating factor, they can hold it over others, and it's the accepted social climate aligned with the authority figure's preferences.
I say fuck that I'll compete teach better, and reward those who do the same in the free market.
gwho You are absolutely right about this. In fact, the situation is worse. Many science academics deliberately treat their subjects as repositories of holy writ to which they have been admitted but which must not admit others. They conceive their job as gatekeepers rather than popularizers , as if passing knowledge on will in some way lessen their own kudos. Typically, they try to mystify the material as much as possibl and talk in impenetrable jargon to help them do this, so we all know who's playing that game. These people should be flagged up, denounced and disincentivized ASAP. And all praise to guys like DrPhysics for going the exact opposite. He is a great teacher, with all the right instincts and a very amicable manner. If anyone should get an OBE it's him.
intentionally obfuscate it, or refuse to teach it simpler, supposedly to filter people out.
I mean, i get the Flynn effect is there too, but it's not the only way.
susskind is harder, more compressed, it is just a higher level and not for beginners.
Global Digital Direct Subsidiarity Democracy yes and no. Some of the subjects are a bit deeper but they are over complicated in my opinion.
Wow I almost understood some of that. Thank you so much for this delicious presentation; equations so sweet you can almost taste them. Yum!
incredible how much can be explained with a felt tip pen and voice
This video is wonderful! It closes a the gaps I didn't understand in other introductions.
This series is a prime of didactics and deepness, for the advanced concepts explained in rational sequence. I shared this video on facebook with my friends ( biomedical researchers in great part ) .Best wishes from Rio.
Im just starting physics but I absolutely understand everything!!
ik, I'm 10 and he is the only person / Ytuber the explains it properly!
Dr.Physics...Chapeau! Your channel conveys the profound knowledge of Natural Philosophy in a simple and efficient manner. Keep it up! :)
Thank you very much, sir, for your passion in teaching these pieces of stuff! It immensely helped me in advancing my physics career and studies! Cheers!
recently had my mind blown when i learned that, strictly speaking, "particles" are not really particles as one might normally envision them and "fields" are not really fields. i still plan to educate myself via your vids, but it is a strange new world for me having learned these things.
very excited to have found the "Einstein Field Equations for beginners" vid. being able to push pause at anytime in order to think carefully about what is being said will enable me to get further with physics then if i was sitting in a lecture hall. thanks for the fascinating uploads DrPhysicsA!
You are a wonderful teacher. I think I understand most of the content as a high school student. I will definitely watch all of your videos.
To whom it may concern. Because of teaching styles if you watch these videos on creation and annihilation operators and then watch professor Susskind's Stanford videos afterwards on introductory particle physics which also talks about the c and a operators they complement each other nicely. Block off 3 to 4 hours of time as i found it better to watch them both around same time.
U r best. I am a physics lover who never made it to actually becoming a scientist. I salute your passion and effort. Keep it up.
I have studied a little of Quantum Mechanics before, but I found this video of you very good. You explain very well!
I'll continue seeing this series of you and other ones too:)
hello professor. Thank you for the very lucid explanations of these concepts. Only the one who knows thoroughly can explain so easily. Einstein I think is supposed to ahve said "if the solution is very simple, god is answering". thanks sir.
I love this, thank you and please don't stop.
Great teacher! now physics seems really different after listening and watching your lectures...
thank you so much may Allah bless you and your entire life and family sir!
its such remarkable work you are doing for free... it's like talking classes in Oxford university!
Awesome channel, this is the best channel for physics.
it's very well done, thank you for all your works
Very interesting and can open eyes in sight of Particle physics
I think I finally found a perfect channel to help me pursue physics
i am understanding it ,step by step ! please carry on !
sir, your videos helps me very much on my studies on quantum mechanics!! thanks so much!
Oldie but goldie! Derivation of TDSE was brilliant.
I was really able to absorbe the vast majority of this. There are some formulas and effects that you speed thru and/or reference, but a bit of wikiGoogle'ing has covered those gaps.
I am new to your series - breadcrumbing and reverse viewing as per your references - and look forward to rekindling my youthful love of math and physics at the atomic and quantum levels. Thank you so much for all this hard work and tsking the time to articulate. I believe I would have excelled better in my early academics had I found someone to explain these topics as you have.
Consuming all of your vidoes will be my goal for this season.
Cheers &much respects.
Dave.
this is why theoretical physicists are either in school or retired. i thank goodness for them...
Jim Dogma has kindly responded. I'll just add that this is consequence of taking the derivative of an exponential. So d/dt of e^iwt = iw e^iwt
Thank you soo much. I love your lectures.
Best teacher ever. Thank you
very strait forward explanation...thank u!
This serves as a really smooth introduction to QFT! Thank you!
I started to read a book about QFT but it got really overwhelming pretty quickly...
"QFT for the Gifted Amateur" seems to be a relatively slow and steady one. Although you posted this 6 years ago so you probably got that covered lol
I enjoy so kuch with your videos..!
Thanks for the great lecture...if only all professors taught their classes at this level...
Hello. Thank you very much for excellent videos! Quick question regarding the explanation at 13:24. If the cricket ball is moving at 100m/s, wouldnt the wave length be below the Planck length? And if so, wouldnt it imply that see the ball moving, so the movement which can be measured, but the wavelength is immeasurably small?
At first I though you were calling him a hat :) After a little research, I now know it's meant to say "hat's off to you with respect."
I came here to learn physics and end up learning language. Chapeau!
great video. great pace.
Very nice lecture thank you. Very well done.
Excellent class, thanks a lot.
This really helps explain the integer values in those equations.
Keep watching this series. It will appear in a later video.
You are the only God I believe in, sir. You are absolutely amazing. I wish I could ever have your intelligence. Thank you so much for these videos.
So educational!!! Even understandable to me!!!
+DrPhysicsA
57:31 - how did you conclude that psi-dagger was 'sum a+ ...' . I've watched the QM concepts vids and took notes but can't remember going over this. This stuff is far ahead of my current physics knowledge but I'm seeming to follow the vids quite well, i can do the maths I'm just not sure how you got an equation for psi-dagger and also psi(x) [the second one]. Thanks!
Excellent work
This man is a prophet of mathematics
So... if I set up a big grating and fire cricket balls at it, they will impact a background screen with an interference pattern showing bands on the order of 6x10^-35m big? That's too small to measure, of course, but am I correct in principle?
Excellent lecture.
Thanks for this. Well put.
At around 53:30 you spoke about how fields can have different wave shapes. With sound waves, we can appreciate different timbres which depend on the wave shape of the sound. Are there similarly different 'timbres' of light?
Great explanation.
Nice explanation@love from India
Thanks for your answer.
It will take some head scratching and some books reading before I fully understant it.
But I have to say, particule physic is "passionnant" (yes I'm french) especially when explained the way you do in your videos.
this is old school teaching and i loveit thank you
Great lesson, thank you.
Very easy to understand, yet advanced.
So brilliant
I do not understand the very last division by (ik)^2 at 1hr3min. How is this legal? Doesn't the ik term and the exponent fall under the leading summation over k? In which case, dividing d2psi/d2x by (ik)^2 is illegal.
Can somebody explain where I have gone wrong?
how is it that you just "create" a+ and a- ? Is there any sort of logical progression from H=1/2(p+iwx)(p-iwx) to a+ and a-? Or is it sufficient to say that a+ and a- are what they are because the commutator happens to be -1 when a+ and a- are given by those equations?
At 33:40 you said the energy is borrowed for a short time even if the energy never existed, is the other way around possible? i.e. can the time be borrowed at the cost of energy?
Question for you, if there is a "virtual" photon between two electrons communicating the force between them, but photons are quantized, does that mean that the strength of electromagnetic force is also quantized? I was under the impression that it changed continuously as the distance between two charged particles changed continuously.
don't say even I dr. :))
you are just as brilliant as the people you are talking about !!
this is blowing my mind. I'm almost certain to go into particle physics now!
Shall I also study nuclear physics as well since they seem related?
Hi, I have a doubt, how can u use h/p for particles like electron since in the earlier part, when you derive the equation, you used the assumption that velocity is = c for photon shdnt p =EC/V squared for a photon ?
Excuse my ignorance, but in the formula derived from E=mc2 they conlcuded that p=h/λ. that works for the photon because it moves at the speed of light (in this case c) but with an electron does it work the same? I mean the electron doesn't move at the speed of light so the isolation couldn't be made from E=mc2 right? I know there is a reasonable explanation for that but I would be really thankful if could you provide me one. Ypur videos are amazing by the way.
Thanks for the lecture!
Weird that it has only garnered ~1% of likes, when most other presentations are usually at an average of 10% of likes.
Must be that most people are afraid of thinking of the physical world from an analytical frame of mind or maybe they think that to "get physics" they have to get it from the "Tree of Knowledge ..."
OMG, is this man a teaching genius, or what? OMG OMG OMG !!!!!!!!!
At 1:04:25 you divided the left side for -(i omega) because it is independent of k but I think dividing the right side for (ik)^2 is not ok at all because it has the sum over k (the sigma term). Can you explain it for me?
this was a mistake -- he should have changed the k^2 -> omega*2m inside the summation sign -- then all would have worked out OK. It seemed to work in the video, but as you noticed it was an accident because you can't just take the k factor outside the summation (or the omega for that matter).
sir you have said on your particle interaction videos that w+ and w- gives off positron and neutrino not electron neutrino. does electron neutrino is same as neutrino?
Thanks for using the paper again! ;)
What physical meaning the imaginary term isin(kx -wt) has in the expansion , e^i(kx - wt) -..........-(I)?
The wave represented by (I) is a cosine wave only, right? Or the sine part has to do anything with this?
I am extremely confused on what is the role of imaginary terms in waves as well as in Currents.
If the time evolution of a wave psi(x) would be written as: psi(x,t)=psi(x) cos(wt), then at certain times t the wave function would collapse completely and the particle would be gone (consider wt = pi/2, 3/2 pi, etc). Writing a wave like e^(iwt) would make sure that |psi(x,t)|^2 = |psi(x)|^2 at all times t.
Well you must be right :-)
I'll keep on scratching my head understanding why :-)
Very good!
17:45 Are you just applying the Euler Formula to waves (and fields)?
at 40.24 you factories the second term. as p and x are operators and they don't commute to each other how can you recover the 2nd line from 3rd one?
Does the annihilation operator act on the vacuum state to produce the anti-particle?
@ 56:49, you replace the α(k) term with the a+(k) term in order to make it a quantum operator. But why? Is it just a "hit-and- miss"? Do we use it because it works, or is there reasoning? And by the way, awesome video!
On the last equation (33:41) you said "uncertanty in energy times the uncertainty in time must be bigger or equal to...".
So which one is more accurate, the 'energy' or the 'time'?
Can you divide by (i k)^2 like that, although k is the index of summation?