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In my notes from today's lecture, I wrote a statement that says: the energy of light that is absorbed or emitted matches the energy difference of an electron moving from one principal quantum level to the other. Can someone clarify and further explain this concept? Does this mean that the energy that a particular atom "receives" that comes from a light source that ends up being absorbed or emitted is the same amount of energy that it takes for an electron of that atom to move up or down from one quantum level to the next?
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