Why divide h by 4pi?


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Vincent Leong 2B
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Joined: Fri Aug 09, 2019 12:15 am

Why divide h by 4pi?

Postby Vincent Leong 2B » Wed Oct 16, 2019 1:55 am

What's the purpose of dividing planck's constant by 4pi? What does this tell us?

Wendy 1E
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Re: Why divide h by 4pi?

Postby Wendy 1E » Wed Oct 16, 2019 9:05 am

Through experimentation, scientists determined that the minimum uncertainty of knowing both a particles momentum and position simultaneously is this value: h/4pi.

Maia_Jackson_2C
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Why divide h by 4pi?

Postby Maia_Jackson_2C » Wed Oct 16, 2019 8:19 pm

Also I think there is a derivation for the equation that would explain why h/4pi is there, but Dr. Lavelle said it was too complicated for us to work through the whole derivation because it uses things we haven't learned yet.

Matthew ILG 1L
Posts: 112
Joined: Sat Aug 17, 2019 12:15 am

Re: Why divide h by 4pi?

Postby Matthew ILG 1L » Thu Oct 17, 2019 8:41 pm

The only real way to see why h is divided by 4pi is to prove the entire equation, which is a very long and arduous process. However, if you are interested in it, here is a helpful link showing the proof.
https://www.quora.com/Why-is-h-divided- ... -principle

Alex Hitti 3E
Posts: 51
Joined: Sat Aug 17, 2019 12:17 am

Re: Why divide h by 4pi?

Postby Alex Hitti 3E » Fri Oct 18, 2019 11:17 am

Scientists found out that 4pi is a constant that is consistent whenever using the formula. If you want a more specific answer, Dr. Lavelle said that to discover this we have to fully understand the derivation of the equation which is a long and tedious process since most of the information we haven't learned yet.

TYun_1C
Posts: 52
Joined: Wed Sep 11, 2019 12:16 am

Re: Why divide h by 4pi?

Postby TYun_1C » Fri Oct 18, 2019 11:30 am

Though I'm not sure about the derivation of this equation/inequality, the essence of what it is trying to convey is that the more we know about momentum, the less we know about position and vice versa. In other words, we must sacrifice one or the other to obtain accuracy in one. Hope this helps!


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