The energy of photon equal to the difference in energy between the atom's excited state and its final state.
The photon energy of the emitted photon is equal to the energy difference between the two states. There are many possible electron transitions for each atom, and each transition has a specific energy difference.
When an atom in an excited state emits a photon of radiation, the energy of the photon is equal to the difference in energy between the atom's excited state and its final state.
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