In a p – n junction photodiode, the value of the photo electromotive force produced by monochromatic light is proportional to:

the barrier voltage at p – n junction the intensity of light falling on the cell the frequency of light falling on the cell the voltage applied at the p – n junction

the intensity of light falling on the cell

In photodiode, the photoelectromotive force is produced by photo – voltaic action i.e. a potential difference is created between two points whose magnitude depends upon the intensity of incident light.