Doppler shift results in the frequency of an incoming photon being continuosly variable from the perspective of another particle based on its velocity
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Apparently even quantized energy levels aren't ENTIRELY quantized. That is, the energy levels have a bit of leeway in the exact amount of energy in them. So they can absorb a small spread of wavelengths and then re-emit them upon decaying.
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Apparently even quantized energy levels aren't ENTIRELY quantized. That is, the energy levels have a bit of leeway in the exact amount of energy in them. So they can absorb a small spread of wavelengths and then re-emit them upon decaying.
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