Psst. Hey, you. Yeah you. Want to understand Quantum mechanics?

disappoint

Lifer
Dec 7, 2009
10,137
382
126
Yeah I know Feynman may have once said "If you think you understand quantum mechanics you don't understand quantum mechanics".

Maybe that is true. But understanding something requires effort. How much effort have you put into it?

The first step, and the hardest one, is to start. Especially if you think it can't be done. Then you won't want to start. So whether it is true or not is not the issue. The issue may be whether it's useful or not to tell people this.

Well here is a start. 8 minutes. That's it. Just 8 minutes of your time. Like you have anything better to do for the next 8 minutes.

Here's a video you'll not want to miss if you're interested in physics, specifically quantum physics.


You can see a great demonstration at around the 6 minute mark using a double pendulum.

The energy transfer between the two pendulums signifies the quantum entanglement of the two electrons.

I wish I could ask him a question though. The 2 pendulums are coupled by the string. What is physically coupling the two electrons?

By the way just to clarify, quantum particles don't really spin. Not like a top the way you might imagine it. Though they do have angular momentum even when they are at rest.

The distinction that spin is not spin as you might imagine it is an important one because one of the biggest hurdles to learning something new is not that you know so little and need to learn so much, but that what you've already "learned" to be true really isn't, and it gets in the way. Yes I know that was a run-on sentence, sorry. What I'm getting at is that unlearning and relearning are more difficult for most people than learning in the first place. This may be one of the (possibly many) reasons why people think children are better learners than adults. I won't go into all of those reasons as it's a bit off the topic at hand.

Physicists sort of did us a disservice by calling it spin because people will confuse it with classical spin when it really isn't that at all. In my opinion they should have called it something else. Is it too late to change it? Maybe. But again that's going a bit off topic.

So what do you think? Did the pendulum demonstration make things a bit clearer? Do you feel as though understanding some quantum mechanics isn't as impossible a task as some might purport it to be?

Phase 2 for when you are ready. A video on quantum entanglement that we can discuss:
 
Last edited:

disappoint

Lifer
Dec 7, 2009
10,137
382
126
Attended Eric L. Michelsen - UCSD Physics recent QM presentation here in town.

http://physics.ucsd.edu/~emichels/SD_Wetlab.pdf

Thanks for the link! I'm going to check out that book.

Question: MKSA system, for the units of measurement. Ampere for charge? Isn't Ampere a unit of current instead of charge? Why not MKSC, denoting Coulomb for charge? Granted charge and current are related, but I would think C would be a better choice.

Also he calls them macroscopic quantities. I've always heard them called units of measurement.
 
Last edited:

C1

Platinum Member
Feb 21, 2008
2,337
87
91
Easy enough ....... just ask him (he teaches physics, basic QM, Electricity & Magnetism).

His personal web page can be found off of here :

http://physics.ucsd.edu/~emichels/


BTW, besides being a nice guy, he definitely struck me as "brilliant."
 

agent00f

Lifer
Jun 9, 2016
12,203
1,242
86
Yeah I know Feynman may have once said "If you think you understand quantum mechanics you don't understand quantum mechanics".

Maybe that is true. But understanding something requires effort. How much effort have you put into it?

The first step, and the hardest one, is to start. Especially if you think it can't be done. Then you won't want to start. So whether it is true or not is not the issue. The issue may be whether it's useful or not to tell people this.

Well here is a start. 8 minutes. That's it. Just 8 minutes of your time. Like you have anything better to do for the next 8 minutes.

Here's a video you'll not want to miss if you're interested in physics, specifically quantum physics.


You can see a great demonstration at around the 6 minute mark using a double pendulum.

The energy transfer between the two pendulums signifies the quantum entanglement of the two electrons.

I wish I could ask him a question though. The 2 pendulums are coupled by the string. What is physically coupling the two electrons?

By the way just to clarify, quantum particles don't really spin. Not like a top the way you might imagine it. Though they do have angular momentum even when they are at rest.

The distinction that spin is not spin as you might imagine it is an important one because one of the biggest hurdles to learning something new is not that you know so little and need to learn so much, but that what you've already "learned" to be true really isn't, and it gets in the way. Yes I know that was a run-on sentence, sorry. What I'm getting at is that unlearning and relearning are more difficult for most people than learning in the first place. This may be one of the (possibly many) reasons why people think children are better learners than adults. I won't go into all of those reasons as it's a bit off the topic at hand.

Physicists sort of did us a disservice by calling it spin because people will confuse it with classical spin when it really isn't that at all. In my opinion they should have called it something else. Is it too late to change it? Maybe. But again that's going a bit off topic.

So what do you think? Did the pendulum demonstration make things a bit clearer? Do you feel as though understanding some quantum mechanics isn't as impossible a task as some might purport it to be?

Phase 2 for when you are ready. A video on quantum entanglement that we can discuss:

The most intuitive yet insightful page I've see on quantum effects is this: https://faraday.physics.utoronto.ca/PVB/Harrison/DoubleSlit/DoubleSlit.html

It goes into the crux of what "uncertainty" means at that level, which gets to the core of why QM is so unintuitive to human minds used to our scale.
 
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