The work function of a metal is $6 e V$ . If two photons each having energy $4 e V$ strike with the metal surface
(i) Will the emission be possible?
(ii) Why?

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Solution

(i) The emission will not be possible .
(ii) The work function is the minimum amount of energy required to eject out electrons from metal surface .In photoelectric emission , one photon gives its whole energy to one electrons and in the given condition , each photon has energy less than the work function therefore electrons will not be emitted .

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