The surface of a metal is illuminted wit...

The surface of a metal is illuminted with the light of 400 nm.the kinetic energy of the ejected phtotlectrons was found to be `1.68 eV.`If hc=1,240 eV nm,the work function of the metla is

1.42 eV

1,51 eV

1,68 eV

3.09 eV

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