In a p–n junction photocell, the photo-electromotive force due to monochromatic light is most closely proportional to:
Options

Question

In a p–n junction photocell, the photo-electromotive force due to monochromatic light is most closely proportional to:

G1 Physics · Accepted Answer

Light photons generate electron–hole pairs. At fixed photon frequency (monochromatic light), greater intensity means a higher incident photon flux and more photogenerated carriers. Over a useful operating range this produces a larger photocurrent and a corresponding photoelectric output. Final answer: Option B (as treated in the source). Strictly, open-circuit photovoltage can vary logarithmically with intensity rather than being exactly proportional.