A photon of energy $3.4 e V$ is incident on a metal having work function $2 e V$ . The maximum kinetic energy of photo electrons is equal to

1.4 e V

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1.7 e V

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5.4 e V

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6.8 e V

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Solution

The correct option is A $1.4 e V$
Work function of a metal is defined as the minimum energy required to eject out electron from metal surface . When a photon of energy $3.4 e V$ is incident on a metal , $2 e V$ energy will be used in ejecting an electron , because the work function of metal is $2 e V$ . And the remaining energy $3.4 - 2 = 1.4 e V$ , will be used by ejected electron as maximum kinetic energy .

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