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### Broglie's equation?

Posted: **Sun Oct 13, 2019 3:53 pm**

by **Giovanni Anguiano-Gutierrez 3L**

A question is asking what the wavelength of an ejected electron is and gives me the incident light of sodium metal (810 nm) and tells me that the work func. for sodium is 1.1 eV. Should I use de Broglie's equation because the wavelength we are trying to calculate is a particle not a photon? My answer came out to be 1.86*10^-9 m.

### Re: Broglie's equation?

Posted: **Sun Oct 13, 2019 3:54 pm**

by **Mashkinadze_1D**

Correct, the electron has mass and therefore you would use De Broglie's equation. Electrons unlike photons have mass and this is listed in the textbook.Hope this helps!

### Re: Broglie's equation?

Posted: **Sun Oct 13, 2019 4:00 pm**

by **gferg21**

The mass of an electron is 9.11x10^-31 kg by the way. I know he mentioned it in lecture only once so some people may not have gotten it down.