Question

Which of the following is true?

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

Answer 1

Answer: (B)

Stopping potential is the negative potential applied to stop the photoelectrons from the metal. Stopping potential is given by $e{V}_0=K_{\max }$ Since, maximum kinetic energy of photoelectrons does not depend on intensity of light, so stopping potential does not vary with intensity of light. Thus, choice is not correct. If intensity of incident light is increased, we can say that the number of photons incident per unit area per unit time will be increased. Therefore, more electrons will be emitted per second. Hence, photocurrent increases. Thus, choice is correct. The photocurrent does not depend on frequency of light. Thus, choice is not correct. The Photocurrent does not depend on applied voltage. Thus, choice is not correct.