Question

Which of the following statement is correct?

• A. The photocurrent increases with intensity of light
• B. The stopping potential increases with increase of incident light
• C. The current in photocell increases with increasing frequency
• D. The photocurrent is proportional to the applied voltage.

Answer 1

The Correct Option is A

The question asks us to determine which statement regarding photocurrent and light is correct. Let's examine the options: 

1. The photocurrent increases with intensity of light
   • This statement is correct. According to the photoelectric effect, the photocurrent, which is the current generated by the photoelectric emission of electrons, is directly proportional to the intensity of the incident light. More intense light means more photons striking the surface, resulting in more ejected electrons and thus a greater photocurrent.
2. The stopping potential increases with increase of incident light
   • This is incorrect. The stopping potential is independent of the intensity of light. It depends on the frequency of the incident light. Different frequencies cause different kinetic energies in electrons but do not alter the stopping potential with changes in intensity.
3. The current in photocell increases with increasing frequency
   • This is incorrect. The frequency of light affects the energy of the emitted electrons, but not the photocurrent directly. Photocurrent depends on the number of photoelectrons ejected, which relates to light intensity, not frequency.
4. The photocurrent is proportional to the applied voltage
   • This is incorrect. While the increase in applied voltage to a certain extent can increase the photocurrent because it further accelerates the electrons, the photocurrent eventually reaches a saturation point where further increases in voltage do not result in an increase in current.

Therefore, the correct statement is:

• The photocurrent increases with intensity of light