what is the photoelectric effect ?
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photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.
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The phenomena of the ejection of electron from the surface of a metal when the light of suitable frequency strikes on it is called photoelectric effect. The emitted electrons are called photoelectric. It was first performed by H. Hertz in 1887. The minimum frequency of light which can eject electron from the surface of metal is called the threshold frequency.
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