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For this exercise, we have a solid that absorbs a photon whose wavelength is 320 nanometers.
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And then it dissipates an energy of 0 .5 electron volts.
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And it releases a photon, represented in the figure by this red, curvy line.
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And we want to calculate what is the wavelength of the photon.
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So we want to calculate the final lambda, lambda f.
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So in order to do that, the thing we need to calculate is the energy of this released photon.
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So by conservation of energy, the energy of the first photon, the incident photon, so i'm going to write it as ei, is equal to the dissipated energy, ed, plus the energy, the final energy of the photon, ef...