Question

In a pn junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional to: -

• A. The intensity of the light falling on the cell
• B. The frequency of the light falling on the cell
• C. The voltage applied at the pn junction
• D. The barrier voltage at the pn junction

Answer 1

The correct option is A The intensity of the light falling on the cell

Photo emf $\propto$ Current through cell
But current $\propto$ Intensity
so photo emf $\propto$ Intensity of light falling on the cell.