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Physics 9 Online
OpenStudy (anonymous):

what happens when electrons move from the excited state to the ground state

OpenStudy (anonymous):

When an electron jumps from an orbit of higher energy to that of lower energy, it emits a photon whose energy is equal to the difference of the two energy levels. To gain a little bit more insight into this topic, watch this video upto 10:45 http://youtu.be/IcOJHJJpd0w?t=8m20s

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