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So today in lecture we talked about how when the electron goes from n=4 to n=2 the change in energy would be negative and so in return the energy of the photon emitted is positive so in return the frequency is positive. But, if the electron goes from n=2 to n=4 then the change in energy will be positive so will the energy of the photon being emitted be negative? If so then would the frequency be negative?
Sammi is correct. For an electron to go up energy levels, energy is required. Thus a photon of light would be absorbed instead of emitted, but the frequency of the light will always be positive.
When you go from a lower energy level to a higher level, energy is require. The electron absorbs this energy, over releasing a photon. So as mentioned, photons will not have a negative value of energy. However, the change in energy of the electron will be positive going up energy levels and negative coming down.
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