What is photoelectric effect? State the result of photoelectric effect experiment.

Explanation

Photoelectric effect when radiation with certain minimum frequency `(V_(0))` strke the surface of a metal. The elec trons are ejected from the surface of the metal. This phenomenon is called photoelectric effect. The electrons emitted are called photoelectrons.

Equipment for studying the photoelectric effect Light of a particular frequency strikes a clean metal surface inside a vacuum chamber.
Electrons are ejected from the metal and are counted by a detector that measures their kinetic energy
The result observed in this experiment were
(i) The electrons are ejected from the metal surface as soon as the beam of light strikes the surface. i.e. there is no tike lag between the striking of light beam and the ejection of electrons from the metal surface.
(ii) The number of electorons ejected is proportional to the intensity or brightness of light.
(iii) For each metal, there is a characteristic minimum frequency, `v_(0)` (also known as threshold frequency) below which photoelectric effect is not observed. At a f requency `vgtv_(0)` the ejected electrons come out with certain kinetic energy. the kinetic energies of these ejections increases withthe increase of frequency of the light used