Calculating Wavelength of electron

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Zack Barta 3I
Posts: 27
Joined: Fri Sep 28, 2018 12:25 am

Calculating Wavelength of electron

Postby Zack Barta 3I » Sun Nov 04, 2018 12:54 am

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: Fri Sep 28, 2018 12:28 am

Re: Calculating Wavelength of electron

Postby janeane Kim4G » Sun Nov 04, 2018 12:56 am

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: Fri Sep 28, 2018 12:29 am

Re: Calculating Wavelength of electron

Postby becca_vandyke_4b » Sun Nov 04, 2018 4:33 pm

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

JiangJC Dis2K
Posts: 72
Joined: Fri Oct 12, 2018 12:16 am

Re: Calculating Wavelength of electron

Postby JiangJC Dis2K » Sun Nov 04, 2018 4:57 pm

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.


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