Photoelectric effect

The photoelectric effect occurs when photoelectrons are ejected from a metal surface in response to monochromatic radiation incident on the surface. It has three characteristics: (1) it is instantaneous, (2) it occurs only when the radiation is above a cut-off frequency, and (3) kinetic energies of photoelectrons at the surface do not depend of the intensity of radiation. The photoelectric effect cannot be explained by classical theory.

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The photoelectric effect is a phenomenon wherein a material emits electrically charged particles when electromagnetic radiation hits it.

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The idea of Newton that light is a stream of light particles was thoroughly refuted by Young and Fresnel followed by Maxwell in the 19th century, but then surprisingly reappeared in the beginning of the 20th century in the work by Planck on blackbody radiation followed by Einstein's formula for the photoelectric effect presented in his 1905 article On a Heuristic Viewpoint Concerning the Production and Transformation of Light: P + W = E with E = h f , where P is the kinetic energy of an…

Photoelectric effect occurs when a light with sufficient energy is shined on the surface of a metal and ejects electrons from the atom.

Photoelectric Effect Class 12 Physics

Einstein spoke eloquently on a number of topics beyond physics, from ambition to living a happy life.