In a p-n junction photocell, the value of the photo-electromotive

In a p-n junction photocell, the value of the photo-electromotive force produced by monochromatic light is proportional to

1. the voltage applied at the p-n junction
2. the barrier voltage at the p-n junction
3. the intensity of the light falling on the cell
4. the frequency of the light falling on the cell

Electromotive force depends upon intensity of light falling, it does not depend on frequency of barrier voltage.