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The photoelectric effect is a phenomenon in which light (electromagnetic radiation) incident on a metal surface causes the ejection of electrons from the metal. For this effect to occur, the light must have a minimum frequency, known as the threshold frequency. If the frequency of the light is below the threshold, no electrons are ejected, regardless of the intensity of the light. However, if the frequency is equal to or higher than the threshold, electrons are emitted with kinetic energy, and increasing the intensity of the light increases the number of ejected electrons but not their individual kinetic energies.
