## Energy of ejected electron from energy of light

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

marcus lin 1E
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Joined: Fri Sep 28, 2018 12:28 am

### Energy of ejected electron from energy of light

Can someone explain how I'd go about calculating the freq/wavelength/energy of an electron when only given the energy of the light used to eject said electron?

Posts: 77
Joined: Fri Sep 28, 2018 12:28 am
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### Re: Energy of ejected electron from energy of light

When you're given the amount of energy of light used to eject an electron it's important to know if there's any excess energy in the form of kinetic energy given off. If there isn't any excess kinetic energy given off then we know the energy of the incoming light is equivalent to the energy of that electron. We would then use c=(wavelength)(frequency) and E=(h)(frequency) (which you would have to combine together when solving for light) to calculate the frequency and wavelength.

Hope this helped! :)