When the surface of a metal is illuminated with the light of wavelength 400 nm, the KE of the ejected photoelectrons is 1.68 eV. Then the work function of the metal is (hc = 1240 eV nm)

3.1 eV 1.42 eV 1.51 eV 1.68 eV

1.42 eV

The correct answer is Option (2) → 1.42 eV