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The photoelectric effect is a phenomenon in which electrons are emitted from a material after it absorbs light energy. It was first observed by Heinrich Hertz in the late 19th century and was later explained by Albert Einstein in 1905.

According to Einstein’s theory, light is composed of photons, each with a fixed amount of energy. When light strikes a metal surface, the photons transfer their energy to electrons within the metal, freeing them from their bonds and causing them to be emitted from the surface. The energy of the emitted electrons is determined by the frequency of the light and is independent of the intensity or brightness of the light.

The photoelectric effect has important implications in a variety of fields, including electronics, where it is the basis for photodetectors, and in the development of quantum mechanics, where it provided evidence for the particle-like behavior of light.