Photoelectric effect
Photoelectric effect: when light is incident on a metal surface then electrons are emitted from it. This phenomena is called photoelectric effect.The emitted electrons are called photoelectrons. Laws of photoelectric emissions : 1. The emission of photo-electrons takes place only when the frequency of incident radiation is above certain critical value of that metal.This critical value is called threshold frequency . 2 . The emission of photo-electrons starts as soon as the light falls on metal surface i.e.the photoelectric emission is instantaneous. 3 . The maximum kinetic energy with which the photo-electrons are emitted from a metal surface is independent of the intensity of the light and only depends upon the frequency. 4 . For a given frequency, the number of photo-electrons emitted is directly proportional to the intensity of incident light . 5 .The energy distribution of the photo-electron is independent of the intensity of the incident light. Experimental st
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