How to find wavelength and frequency of electron if given its velocity?

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Alyssa_Hsu_2K
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Joined: Wed Sep 21, 2016 3:00 pm

How to find wavelength and frequency of electron if given its velocity?

Postby Alyssa_Hsu_2K » Fri Sep 30, 2016 3:09 pm

The problem says: The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 x 10^3 km/s. What is the wavelength of the ejected electron?

I know I can use 0.5mv^2 to find the energy of the electron. However, I can't use E=hv and c=wavelength x frequency to find wavelength because those are equations for light. Hence, I'm stuck.

Natassia Dunn 3G
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

Re: How to find wavelength and frequency of electron if given its velocity?

Postby Natassia Dunn 3G » Fri Sep 30, 2016 3:15 pm

I think in order to solve that question, you could use the equation: wavelength= h/p, which could be changed into wavelength= h/(mass*velocity). By plugging in Plancks constants, the mass of an electron, and its velocity, you can solve for wavelength.


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