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It is the phenomenon of emission of electrons from the surface of metals, when light radiations (Electromagnetic radiations) of suitable frequency drop on them. The emitted electrons are called as photoelectrons and the current so produced is known as photoelectric current.
This effect is related on the rule of conservation of energy.
A metal has a work function of 4.80 eV. Will ultraviolet radiation with a wave length of 385 nm be able to eject a photoelectron from the metal?
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The units that may be derived from fundamental units are known as derived units.
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