How much energy is required to release one photon?
Photons are commonly emitted by electrons in atoms. When an atom is in an excited state, one or more of its electrons are pushed into a higher energy level. When an electron drops into a lower energy level, it releases the energy by releasing a photon at a precise frequency which corresponds to the difference between the two energy levels. Photons can have any frequency from the very low frequency radio waves, through visible light up to the very high frequency gamma rays. This means a photon can be released by any amount of energy.
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