Question

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

• A. The voltage applied at $p-n$ junction
• B. The barrier voltage at $p-n$ junction
• C. The intensity of light falling on cell
• D. The frequency of light falling on cell

Answer 1

Answer: (C)

The intensity of light falling on cell

When a light ( wavelength sufficient to break the covalent bond ) falls on the junction, new hole electron pairs are created. No. of produced electron hole pair deponed upon no. of photons. So photo emf or current proportional to intensity of light. Hence, in a p−n junction photocell, the value of photoelectromotive force produced by monochromatic light is proportional to the intensity of light falling on cell.