The photoelectric effect is a phenomenon in physics where electrons are emitted from a material when it is exposed to light or electromagnetic radiation. This effect occurs when photons of light with sufficient energy strike the surface of a material, causing electrons in the material to be ejected. This effect was first observed by Albert Einstein and is a key concept in understanding the interaction between light and matter. The photoelectric effect is also used in various applications, such as solar cells, photomultiplier tubes, and photoelectric sensors.
