Determining Velocity of Photon
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I need some help with the following question:
A photon with a wavelength of 3.091 x 10-7 m strikes an atom of hydrogen. Determine the velocity (in meters/second) of an electron ejected from the excited state, n = 3.
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The expert determines the velocity of photon.
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Assuming the electron is already in the n = 3 state, I'm getting:
Delta E= K(1/n^2-1/?^2) ...
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