Page "Electromagnetic field" Paragraph 7
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Although modern quantum optics tells us that there also is a semi-classical explanation of the photoelectric effect — the emission of electrons from metallic surfaces subjected to electromagnetic radiation — the photon was historically ( although not strictly necessarily ) used to explain certain observations.
It is found that increasing the intensity of the incident radiation ( so long as one remains in the linear regime ) increases only the number of electrons ejected, and has almost no effect on the energy distribution of their ejection.
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