## Identifying the need to use DeBroglie Equation

$\lambda=\frac{h}{p}$

J Medina 2I
Posts: 102
Joined: Wed Sep 25, 2019 12:17 am

### Identifying the need to use DeBroglie Equation

What kind of things in a problem suggest that we use DeBroglie's equation?

Haley Fredricks 1B
Posts: 53
Joined: Sat Aug 24, 2019 12:16 am
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### Re: Identifying the need to use DeBroglie Equation

Any mention of something that has a mass (electrons, protons, neutrons, etc) will use DeBroglie's Equation, while any light/photons will NOT, because they do not have mass.

Isabel Day 1D
Posts: 48
Joined: Fri Aug 09, 2019 12:15 am

### Re: Identifying the need to use DeBroglie Equation

You will use the De Broglie equation in most quantum questions when the question asks for either the momentum, frequency, or wavelength of an electron. If you given any 2 of these variables, you can find the other using wavelength=h/mv. You can also find the energy of an electron using this equation and Planck's equation: E=hv.