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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

Correct answer: the intensity of the light falling on the cell

Solution

The photo-electromotive force in a p-n junction photocell is directly proportional to the intensity of the incident light, as it determines the number of electron-hole pairs generated.

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