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The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is (hc = 1240 eV nm)


( A ) 1.41 eV
( B ) 151 eV
( C ) 1.68 eV
( D ) 3.09 eV

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