### When to use the Planck's Constant?

Posted:

**Sun Oct 13, 2019 9:51 pm**I notice we used 6.63 x 10^34 in an example in class when finding the wavelength, is there any other formulas I might need to use the equation for?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=14&t=47407

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Posted: **Sun Oct 13, 2019 9:51 pm**

I notice we used 6.63 x 10^34 in an example in class when finding the wavelength, is there any other formulas I might need to use the equation for?

Posted: **Sun Oct 13, 2019 9:54 pm**

I believe that Planck's Constant (h) is also able to be used when determining the energy level of an electron.

E_{n} = -hR/n^{2}

E

Posted: **Sun Oct 13, 2019 10:01 pm**

i believe that Planck's Constant (h) is also used in De Broglie's Wave Equation

Posted: **Sun Oct 13, 2019 10:13 pm**

You can use Planck's constant when you are determining the energy of a photon (E = hv) and the energies at different n levels ( En = -hR / n^2)

It is also used in De Broglie (lambda = h/p).

It is also used in De Broglie (lambda = h/p).

Posted: **Sun Oct 13, 2019 10:26 pm**

Planck's constant is used to relate the relationship between frequency and the energy of a proton, so it is used in the equation E=hv, h being Planck's constant.

Posted: **Mon Oct 14, 2019 1:58 am**

Planck's constant can be used to find the energy emitted or absorbed at different levels with En = -hR / n^2. This has n= energy level, h=Planck's constant, R=constant value, and E=energy.

Posted: **Mon Oct 14, 2019 9:16 am**

Planck's constant is basically used whenever the variable "h" appears in a formula. As of now, I feel like it appears when talking about energy emitted or absorbed at n=some energy level or when determining the energy of a photon (E=hv).