A photocathode has a work function of 2.4 eV. It is illuminated with monochromatic radiation whose photon energy is 3.9 eV The maximum kinetic energy of the photoelectrons produced is:
1
2.4 × 10-19 J
2
3.7 × 10-19 J
3
4.6 × 10-19 J
4
More than one of the above
5
None of the above