Lecture 9 | Modern Physics: Quantum Mechanics (Stanford)

[xtremetom180]

nice intro <3

[bbsonjohn]

It freaks me off when he said Michaelson-Morley experiment ><

[jamma246]

I find the following interesting:

In classical mechanics, to determine the state of the system at all times, you need to know the original position of the particle and it's momentum.

In QM, all you need to know is the position operator. Once you know that, you know the momentum too (as long as you don't disturb the system).

Quite interesting, poetically it's more deterministic!

[d95mback]

@jamma246 you need to know the wave function, which captures both position and momentum (by the hermetian operators that "measure" position and momentum). The fact that the eigenvectors for the operators are orthogonal means that the the probability for a certain measurement can't be 1 for both of them at once.

[tanczosandras]

1:05:53

Simple things my ass.

[Emiffe]

I love that intro! Stanford, your the best!

[littshepkid]

i wish i was smart like him

[MrRobotoToo]

@littshepkid Just keep studying for the next few decades and you will be.

[bhigr]

Again, great lecture. A handout/short booklet with the most important results/equations like the correspondence between poisson brackets and commutators would be great.

[HelloIAmDaniel]

@bhigr there's nothing to stop you taking notes... like you should be doing :p

[bhigr]

@HelloIAmDaniel Taking notes prevents you from listening to the lecture attentively. It is smarter to merely listen and study the handout after the lecture.

[HelloIAmDaniel]

@bhigr watch, pause, take notes, unpause, summarise at the end

writing things in your own words is far better for aiding your understanding than just listening and reading

.. maybe that's just me

[bhigr]

@HelloIAmDaniel That's just you. I immediately try to apply the learned to simple problems in order to find out whether I have understood them. This also helps me memorize it and understand. Copying things is rather ineffective, boring and tedious for me.

[HelloIAmDaniel]

@bhigr each to their own I guess lol

[StAngersucks]

@bhigr I honestly think most people would benefit from using good note taking technique, I think there's studies on that, but let's just say that you're about the only one, aside from some really slacky slackers I know, that don't think taking notes help. But again, that's just me telling me that your things are just you.

[bhigr]

@StAngersucks Oh, I am not the only one. We took turns in taking notes so everyone else could listen attentively.

[StAngersucks]

@bhigr Whatever floats your boat!

[ab616ful]

susskind rulz !!!!!!!

[cakeplus8psycho]

wonderful lecture, thank you for sharing this.

[toughgy123]

A big thanks to the folks at Screw U!

[auralium]

Félicitation pour cette vidéo !

Un trésor pour l'étudiant en physique.

Merci beaucoup.

[anjilong]

thank you Stanford u.