Answer :

Final answer:

An atom emits a photon when an electron transitions to a lower energy level, releasing a photon with energy equal to the energy difference between the levels.


Explanation:

When an atom emits a photon, it does so when an electron transitions from a higher energy level to a lower one, releasing a photon to carry off the excess energy. The energy of the emitted photon is equal to the energy difference between the two energy levels. This process is known as emission and can occur as a result of various factors including absorption of a photon or thermal energy.


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