## Calculating Wavelength of electron

Zack Barta 3I
Posts: 27
Joined: Thu Sep 27, 2018 11:25 pm

### Calculating Wavelength of electron

If the wavelength of incident light on sodium metal was 810 nm, and the work function of
sodium is 1.1 eV, what is the wavelength of the ejected electron?

Am I correct in using de Broglie's equation because the wavelength we are trying to calculate is a particle not a photon?

I got 1.86*10^-9 m.

pls help

janeane Kim4G
Posts: 31
Joined: Thu Sep 27, 2018 11:28 pm

### Re: Calculating Wavelength of electron

I haven’t done the computation for this lol but you’re right to use deBroglie, as the question isn’t for a photon

becca_vandyke_4b
Posts: 30
Joined: Thu Sep 27, 2018 11:29 pm

### Re: Calculating Wavelength of electron

Do you use de Broglie when calculating wave length for an electron and c=lambda times frequency for a photon?

JiangJC Dis2K
Posts: 60
Joined: Thu Oct 11, 2018 11:16 pm

### Re: Calculating Wavelength of electron

The equation you would use is Energy (photon) - Work Function=Kinetic Energy of Electron=1/2mv^2. And then use the known value of mass of electron to solve for velocity to plug into heisenberg's.