Thank you for sharing these amazing lectures :) Students in these times have an incredible advantage from being able to enjoy so many sources of knowledge.
17:00: "Without this (the rule of adding probability amplitudes instead of probabilities) quantum mechanics wouldn't make any sense and without quantum mechanics our civilization would fall apart". Remarkable.
I just came back from a physics trip to Oxford, and there was a lecture we attended. Surprisingly this professor was also there, and we had a conversation (inc our teacher) wit him. Now I'm seeing him here on RUclips, crazy stuff man.
Hi +Jovon Williams,you can apply for two subjects where they exist as so-called 'Joint Honours' degrees - for instance, Physics and Philosophy. Take a look at the course listing to see which combinations are available at Oxford.
University of Oxford This course is great! I already saw some of the lectures of Professor Binney, but I have a question: It's possible to improve the quality of image and sound of this videos? If you can, surely that will help thousands of physics students around the globe. Thanks for answer & uploading!
These Classes are soberb ! finally I found real good stuf on quantum mechanics on youtube, apart from it, only Feynman lectures are real good material, does not mean other classes should be removed, for they migth cover different subjects....Congratulations to James Binney !
Yeah that happens a lot with the subject. Pretty much every physicist will tell you that no one "understands" quantum mechanics, meaning it's not a theory that jives with intuition at any level. Richard Feynman was one of the giants of quantum theory and he's the one who really popularized the phrase "If you think you understand quantum mechanics... You've yet to understand quantum mechanics." We can still use it to make (very accurate) predictions and such, though.
Einstein wasn't arguing that humans will never be limited by inaccuracy, he was arguing that there is no intrinsic 'spontaneity' in the universe, i.e. it is not that humans do not play dice, but that "God", meaning metaphorically the natural world, doesn't; which is counter to the understanding of the quote demonstrated by the lecturers refutation of it. The use of variable mathematics to describe a predicament does not suggest a lack of theoretical absolute predictability of such a predicament.
The weirdest thing here is that on a first QM lecture a professor says: "Nobody knows why thats the right rule... this is the fundamental cornerstone of QM." WTFFFF?
Quantum mechanics is theory. He does nice job of communicating that this a theory and only our best guesses based upon observations. Most teachers, mostly through their insecurities and misinformation, pretend that quantum mechanics is absolute fact. The students are not convinced and the teacher just stumbles around. Binney does not make that mistake.
if someone knows what level this course is at it would help me a lot. i'm preparing for a modern physics course that includes QM which comes after electromagnetism. is this more advanced than that?
Could someone help me out of the following problem? His statements seem inconsistent. At 09:16 he states sigma-additivity: P(A or B) = P(A)+P(B), for A, B mutually exclusive events. At 13:23, he writes: P = |A|^2. Now, going through path S and going through path T are surely mutually exclusive events with probabilities |A(S)|^2 and |A(T)|^2. At 14:32, he presents P(x) as the probability of the disjunction of S and T. Despite this, at 15:21, he writes: P(x) = |A(S)+A(T)|^2, which is not in general the same as P(S)+P(T) = |A(S)|^2+|A(T)|^2^. Quantum probability is in fact sigma-additive for orthogonal propositions, as S and T seem to be. Hence P(x) = P(S or T) should equal P(S)+P(T) = |A(S)|^2 + |A(T)|^2 =/= |A(S) + A(T)|^2.
e is the the exponential. 2.76.... e^(ix)=cosx+i sinx (where i=square root of -1) is Euler's formula which is used because it is easier to take derivatives and since it is complex you can just take the real part of it like he did in the interference term.
the one thing i'm not getting is how did the bullet change directory if both shots are fired from the same space and time and had different angles in relation to the supposed spot of contact?
"e" is exponential "e". Using exponential notation you can basically write a complex number i.e. e^(ix) = cosx + isinx. Here cosx is a real part and isinx is a complex part. Thus, when he derives quantum interference he uses cos (phi(S) - phi(T)), the real part.
e is Euler's number and is 2.7182818459045... It is irrational, and there are several ways to define e. the limit of ( 1 + 1/n ) ^ n as n approaches infinity is e. This is used for constantly compounding interest d/dx ( e^x ) = e^x or, the derivative of e^x is itself. it is the Riemann sum between n = 0 and n = infinity of 1/n! where n! means n factorial. it is also the natural base, where the natural log, or ln, can be defined as integral of 1/x dx
Kindly correct me if i m wrong.. video time 18: 35m, sir explained that the width in the graph of probability distribution is due to width on the slit. Do he means that if the width in the graph of probability distribution is directly proportional to the width of the slit or is inversely proportional to the width of the slit. A/c to me, the latter should be true. Kindly correct me if i m wrong.
[quote]"Without quantum mechanics, our civilisation would fall apart".[unquote] I'm not sure about that! But I'm not a professor of physics at Oxford University, and this man is. However, I don't think he is making a scientific statement there. Our civilisation relies more on empiricism [i.e. making things work] than any theoretical rationalisation about the movement of quanta. We think nuclear weapons, TVs, and microwaves work on the basis of theories that most scientists and engineers broadly agree on, but in reality these are observations of things that work and explanations of the way things work that 'we' have made.
Without quantum mechanics you wouldn't have computer from which you wrote that comment. Transistors in the processor of your computer uses quantum tunneling to work. Our civilization is dependent on computers and accumulating of information. Without that, our current civilization would fall apart completely.
The usefulness of quantum mechanics IS an absolute fact. I'm not sure what you mean when you say that teachers "pretend" that quantum mechanics is an absolute fact. Theories in science are as close to facts as one can get.
Here we are back to the development of the picture tube. Ups I forgot the magnetic field provided by the yoke to direct the electrons to sweep the screen. I forgot a lot of stuff. .
Hi Tristan, search for "Oxford Undergraduate Physics" to learn more about entrance requirements. Don't forget that this is a second-year course so you'll have done a year of physics before taking this course.
The early analogy of probabilities in QM to horse races is surely false, as the horse races is a case of hidden variables, whereas, QM is supposed not to be caused by hidden variables - Bell's inequality
I think it very much works when you take it at face value in a basic way. Kind of like the Brian Cox lecture where there was a bit of controversy over using energy rather than quantum state for electrons, technically not correct but the concept is explained in a basic and easy to understand way
because unlike quantum mechanics , u can eat pizza, otherwise u wud die, although it is rather unhealthy. i think the question u are asking is , is quantum mechanics the most important field in science? my answer is no
If everything is an manifestation of quantum physics; how come we haven't learned anything from dark energy. And no ! Do not comment back on my comment. I posted these in reference to the professor; we though he won't reply.
Thank you for sharing these amazing lectures :)
Students in these times have an incredible advantage from being able to enjoy so many sources of knowledge.
A good ground level QM course online has been a-wanting for a good time. Thank you.
17:00: "Without this (the rule of adding probability amplitudes instead of probabilities) quantum mechanics wouldn't make any sense and without quantum mechanics our civilization would fall apart". Remarkable.
I just came back from a physics trip to Oxford, and there was a lecture we attended. Surprisingly this professor was also there, and we had a conversation (inc our teacher) wit him. Now I'm seeing him here on RUclips, crazy stuff man.
Hi +Jovon Williams,you can apply for two subjects where they exist as so-called 'Joint Honours' degrees - for instance, Physics and Philosophy. Take a look at the course listing to see which combinations are available at Oxford.
University of Oxford This course is great! I already saw some of the lectures of Professor Binney, but I have a question: It's possible to improve the quality of image and sound of this videos? If you can, surely that will help thousands of physics students around the globe. Thanks for answer & uploading!
The beauty of the subject will cause the lecturer to levitate!
Silly me. I thought I'd understand something.
Because one blackboard is too mainstream
These Classes are soberb ! finally I found real good stuf on quantum mechanics on youtube, apart from it, only Feynman lectures are real good material, does not mean other classes should be removed, for they migth cover different subjects....Congratulations to James Binney !
Yeah that happens a lot with the subject. Pretty much every physicist will tell you that no one "understands" quantum mechanics, meaning it's not a theory that jives with intuition at any level. Richard Feynman was one of the giants of quantum theory and he's the one who really popularized the phrase "If you think you understand quantum mechanics... You've yet to understand quantum mechanics." We can still use it to make (very accurate) predictions and such, though.
Einstein wasn't arguing that humans will never be limited by inaccuracy, he was arguing that there is no intrinsic 'spontaneity' in the universe, i.e. it is not that humans do not play dice, but that "God", meaning metaphorically the natural world, doesn't; which is counter to the understanding of the quote demonstrated by the lecturers refutation of it. The use of variable mathematics to describe a predicament does not suggest a lack of theoretical absolute predictability of such a predicament.
The weirdest thing here is that on a first QM lecture a professor says: "Nobody knows why thats the right rule... this is the fundamental cornerstone of QM." WTFFFF?
Quantum mechanics is theory. He does nice job of communicating that this a theory and only our best guesses based upon observations. Most teachers, mostly through their insecurities and misinformation, pretend that quantum mechanics is absolute fact. The students are not convinced and the teacher just stumbles around. Binney does not make that mistake.
I wonder who's gonna clean the board after the class
@alvaro2416, the link is now added to the description of the video. Hope it helps!
How do you write on the upper blackboards?
This is the standard course you would like to watch. Learn it by doing some real maths.
5:28, like probabilities of the electromagnetic field, you never know when your students will enter the class :P.
It's introductory so it is perfect for your level.
if someone knows what level this course is at it would help me a lot. i'm preparing for a modern physics course that includes QM which comes after electromagnetism. is this more advanced than that?
Could someone help me out of the following problem? His statements seem inconsistent. At 09:16 he states sigma-additivity: P(A or B) = P(A)+P(B), for A, B mutually exclusive events. At 13:23, he writes: P = |A|^2. Now, going through path S and going through path T are surely mutually exclusive events with probabilities |A(S)|^2 and |A(T)|^2. At 14:32, he presents P(x) as the probability of the disjunction of S and T. Despite this, at 15:21, he writes: P(x) = |A(S)+A(T)|^2, which is not in general the same as P(S)+P(T) = |A(S)|^2+|A(T)|^2^. Quantum probability is in fact sigma-additive for orthogonal propositions, as S and T seem to be. Hence P(x) = P(S or T) should equal P(S)+P(T) = |A(S)|^2 + |A(T)|^2 =/= |A(S) + A(T)|^2.
This course is introductory so it is just fine for your level.
His own. "The Physics of Quantum Mechanics: An Introduction."
e is the the exponential. 2.76.... e^(ix)=cosx+i sinx (where i=square root of -1) is Euler's formula which is used because it is easier to take derivatives and since it is complex you can just take the real part of it like he did in the interference term.
the one thing i'm not getting is how did the bullet change directory if both shots are fired from the same space and time and had different angles in relation to the supposed spot of contact?
How do you see what's on the boards if you're at the back of the room?
"e" is exponential "e". Using exponential notation you can basically write a complex number i.e. e^(ix) = cosx + isinx. Here cosx is a real part and isinx is a complex part. Thus, when he derives quantum interference he uses cos (phi(S) - phi(T)), the real part.
Watching this lecture in 2024🙏
e is Euler's number and is 2.7182818459045... It is irrational, and there are several ways to define e.
the limit of ( 1 + 1/n ) ^ n as n approaches infinity is e. This is used for constantly compounding interest
d/dx ( e^x ) = e^x or, the derivative of e^x is itself.
it is the Riemann sum between n = 0 and n = infinity of 1/n! where n! means n factorial.
it is also the natural base, where the natural log, or ln, can be defined as integral of 1/x dx
Is it possible to apply for two subjects at Oxford and major in both or do I have to minor in one.
Anybody knows the book he is using?
The width of the graph is not the point. Source projects a cone, so one element (foton, electron, bullet) can go through either slit.
16:24 wow.. inspirational !
Kindly correct me if i m wrong..
video time 18: 35m, sir explained that the width in the graph of probability distribution is due to width on the slit. Do he means that if the width in the graph of probability distribution is directly proportional to the width of the slit or is inversely proportional to the width of the slit.
A/c to me, the latter should be true. Kindly correct me if i m wrong.
nice lecture
[quote]"Without quantum mechanics, our civilisation would fall apart".[unquote]
I'm not sure about that! But I'm not a professor of physics at Oxford University, and this man is. However, I don't think he is making a scientific statement there. Our civilisation relies more on empiricism [i.e. making things work] than any theoretical rationalisation about the movement of quanta.
We think nuclear weapons, TVs, and microwaves work on the basis of theories that most scientists and engineers broadly agree on, but in reality these are observations of things that work and explanations of the way things work that 'we' have made.
Without quantum mechanics you wouldn't have computer from which you wrote that comment. Transistors in the processor of your computer uses quantum tunneling to work. Our civilization is dependent on computers and accumulating of information. Without that, our current civilization would fall apart completely.
Where is the 002 class?? :)
Do you have the solution professor talks about that too? If you can have that, it really help to understand Quantum Mechanics.
anyone know where i can find the problems sets?
This is introduction to Quantum Mechanics for beginners. If you are taking quantum mechanics, after taking Modern Physics, this helps.
Sorry what does the "e" symbolize at 21:06, im a bit confused :/ its not epsilon is it?
I'm doing GCSE science. I think I should leave... LOL
The usefulness of quantum mechanics IS an absolute fact. I'm not sure what you mean when you say that teachers "pretend" that quantum mechanics is an absolute fact. Theories in science are as close to facts as one can get.
Excellent. :)
Here we are back to the development of the picture tube. Ups I forgot the magnetic field provided by the yoke to direct the electrons to sweep the screen. I forgot a lot of stuff. .
How much background knowledge is required for this course?
Hi Tristan, search for "Oxford Undergraduate Physics" to learn more about entrance requirements. Don't forget that this is a second-year course so you'll have done a year of physics before taking this course.
16:58 mind blown!
he uses his own book he's written
thank you
wow.
just...wow.
Why to use probability if we can ensure that every thing will be there by the time it gets there.
Quimica R we can't ensure if it gets there
nice thanks for the information :D
me 15 i am in trigonometry wait until i learn calculus
I don't get it >.
The early analogy of probabilities in QM to horse races is surely false, as the horse races is a case of hidden variables, whereas, QM is supposed not to be caused by hidden variables - Bell's inequality
I think it very much works when you take it at face value in a basic way. Kind of like the Brian Cox lecture where there was a bit of controversy over using energy rather than quantum state for electrons, technically not correct but the concept is explained in a basic and easy to understand way
Perhaps
Why is he not maintaining eye contact with the audience?
epic link is epic
the board can be scrolled down
he wrote the book.
Quantum mechanics is the most important thing in society? Even more important then pizza? Why doesn't everyone know this?
This is the reason for which I never went to schooll
he is repeating the contents of a book...one after another...at this age he could do it himself !!
because unlike quantum mechanics , u can eat pizza, otherwise u wud die, although it is rather unhealthy. i think the question u are asking is , is quantum mechanics the most important field in science? my answer is no
16:23 ...wow
antigravity
Lol, too easy
dark matter
If everything is an manifestation of quantum physics; how come we haven't learned anything from dark energy. And no ! Do not comment back on my comment. I posted these in reference to the professor; we though he won't reply.