Formula confusion


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sarahtang4B
Posts: 132
Joined: Fri Sep 28, 2018 12:27 am

Formula confusion

Postby sarahtang4B » Mon Oct 22, 2018 10:47 pm

Why are the two "h" variables different in the wavelength=hp formula and the Heisenberg equation. In the wavelength equation, I saw on the homework it's plancks constant but for the uncertainty equation it's 1.054e-34. Where does that number come from and why are the two h variables different?

Hanlin Zhu 4G
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

Re: Formula confusion

Postby Hanlin Zhu 4G » Mon Oct 22, 2018 10:51 pm

They are different but related. In the Heisenberg equation, the constant you mentioned that has the value 1.05457 x 10^-34 is actually not h. It is "h bar", which means h/2pi.

sarahtang4B
Posts: 132
Joined: Fri Sep 28, 2018 12:27 am

Re: Formula confusion

Postby sarahtang4B » Mon Oct 22, 2018 10:52 pm

Will the constant be given on tests?

Gary Qiao 1D
Posts: 66
Joined: Fri Sep 28, 2018 12:26 am

Re: Formula confusion

Postby Gary Qiao 1D » Mon Oct 22, 2018 10:56 pm

The h in the heisenberg equation actually has a slash through the h, which symbolizes h/2π. This means that the "h" variable, the planck constant, 6.63 x 10^-34 Js is the same in both the wavelength = hp and heisenberg equation.

Gary Qiao 1D
Posts: 66
Joined: Fri Sep 28, 2018 12:26 am

Re: Formula confusion

Postby Gary Qiao 1D » Mon Oct 22, 2018 10:57 pm

The h constant would be given on the test

anishathomas
Posts: 35
Joined: Fri Sep 28, 2018 12:25 am

Re: Formula confusion

Postby anishathomas » Mon Oct 22, 2018 11:10 pm

I used h as the same value for both questions-and it worked. Just make sure you use h/4pi instead of h/2pi instead of the different value of h.


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