Photoelectric Effect

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When light falls on certain metal surfaces, electrons are emitted. This is known as the photoelectric effect .

Photoelectric emission is the giving off of electrons from a metal surface when light of appropriate frequency falls on the surface of the metal.

The emitted electrons are called photo-electrons .

In 1902, Lenard observed that the maximum kinetic energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More of emitted electrons is independent of intensity but directly proportional to its frequency or wavelength.

When the intensity of light increases, the kinetic energy does not increase; only the number