A photon of energy 3.4 eV is incident on a metal having work function 2 eV. The maximum K.E. of photo-electrons is equal to

1.4 eV

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1.7 eV

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5.4 eV

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6.8 eV

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Solution

The correct option is A

1.4 eV

$K_{m a x} = (E - W_{0})$ = (3.4 - 2) eV = 1.4 eV

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