Question

Assertion : The kinetic energy of photoelectron ejected increases with the frequency of incident light.
Reason : Increase in intensity of incident light increases the photoelectric current.

• A. If both Assertion and Reason are correct and the Reason is a correct explanation o f the Assertion.
• B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
• C. If the Assertion is correct but Reason is incorrect.
• D. If the Assertion is incorrect but Reason is correct.

Answer 1

Answer: (B)

K.E. $=h\left(v-v_0\right) ;$ K.E. increases linearly with $v$, the frequency. The rate of emission of photoelectrons i.e., the photoelectric current is directly proportional to the rate of impinging photons i.e. the intensity of light.