Wavelength from Work Function

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Sunia Akaveka 4I
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Wavelength from Work Function

Postby Sunia Akaveka 4I » Sun Nov 10, 2019 1:37 am

Hypothetically, if a chemistry test in this class had a problem where you had to find the wavelength from just the provided work function value, what would you do? This TOTALLY didn’t give me a hard time on a chem test or anything hahaha jk...unless?

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Re: Wavelength from Work Function

Postby Goyama_2A » Sun Nov 10, 2019 2:09 am

Assuming you’re talking about the wavelength of light, you would use the E= Kinetic Energy + work function formula in order to find the energy of the photon. I believe I remember the question asking for the wavelength of the photon which emitted the electron. If you’re looking for the wavelength of the photon with minimum required energy, you would plug in zero for kinetic energy. However, if they indicated that the electron was moving with a certain velocity after being ejected, you would plug that velocity into (1/2)mv for the kinetic energy. You would then use your kinetic energy and work function to find the energy of the incoming photon. Plug that energy into lambda= hc/E in order to get your wavelength.

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