Question

Statement- 1: The kinetic energy of photoelectrons increases with increase in frequency of incident light.

Statement- 2: The number of photoelectrons ejected increases with increase in intensity of light.

• A. Both the statements are true.
• B. Statement- 1 is true and statement- 2 is false.
• C. Both the statements are false.
• D. Statement- 1 is false and statement- 2 is true.

Answer 1

The correct option is A Both the statements are true.

$h\nu =h{\nu }_0+\text{K.E.}$
$\text{K.E.}=h\nu -h{\nu }_0$

The kinetic energy of an ejected electron is directly proportional to the frequency of the incident light. Hence, as we increase the frequency of the photon, the ejected electron's kinetic energy will also increase.

If we increase the intensity of the incident light, the number of incident photons will increase and so will the number of ejected photoelectrons.

Thus, both the statements are correct.