JEE Main 2009 Physics question

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

• (1)3.09eV
• (2)1.41eVCorrect
• (3)151eV
• (4)1.68eV