photoelectric effect

transfer of energy from light rays that touch the electrons in a substance

The photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such as x-rays or visible light. The emitted electrons can be referred to as photoelectrons in this context. The effect is also termed the Hertz Effect, due to its discovery by Heinrich Rudolf Hertz, although the term has generally fallen out of use.
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In certain materials, the changes in the electrical characteristics caused by photon absorption.

Ejection of electrons from an atom or molecule that has absorbed a photon of sufficient energy. The photoelectric effect is the operating principle behind "electric eyes" it is experimental evidence for particle-like behavior of electromagnetic radiation .

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