A beam of photons with an energy of 10.5 eV strike a metal plate. The photoelectrons are emitted with maximum velocity of 1.6 × 106 m/s. The work function of the metal is
(Assume mass of electron = 9 × 10-31 kg and Charge of electron = 1.6 × 10-19C)
1
3.0 eV
2
3.1 eV
3
3.3 eV
4
3.5 eV