Question

Consider the two following statements I and II, and identify the correct choice given in the answers

1. In photovoltaic cells, the photoelectric current produced is not proportional to the intensity of incident light.

2. In gas-filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.

• A. Both 1 and 2 are true
• B. Both 1 and 2 are false
• C. 1 is true but 2 is false
• D. 1 is false but 2 is true

Answer 1

Answer: (D)

In photovoltaic cells, photoelectric current produced is proportional to the intensity of incident light, so the statement $1$ is false.
The velocity of photoelectrons depends upon the maximum kinetic energy of photoelectrons, which depends on the frequency and hence on the wavelength of incident radiation, so the statement $2$ is true.