The figure shows a plot of photocurrent versus anode potential for a photosensitive surface for three different radiations. Which one of the following is a correct statement?
Answer & explanation
Correct answer: option 2
The energy of the incident photon is hν.
Hence frequency determines the energy of incident photons. This energy is imparted on the photosensitive surface to cause photo ejection. At the points where curve cuts the x axis, the incident photon energy is equal to the work potential of material. Hence energy, hence frequency, is same for radiation of curves a & b.
Intensity is the measure of number of photons striking per unit time. Thus they determine the amount of photocurrent produced. Thus it is same for b & c.