Question

When light is incident on a metal surface, the maximum kinetic energy of emitted electrons:

• A. Varies with intensity of light
• B. Varies with frequency of light
• C. Varies with speed of light
• D. Varies irregularly

Hint:

Increasing the intensity of light increases the number of photoelectrons but does not change their maximum kinetic energy.

Answer 1

The Correct Option is B

Step 1: {Photoelectric Equation} 
According to Einstein’s photoelectric equation: \[ K_{{max}} = h\nu - W_0 \] where: - \( h \) is Planck’s constant, - \( \nu \) is the frequency of incident light, - \( W_0 \) is the work function of the metal. 
Step 2: {Dependence on Frequency} 
Since \( K_{{max}} \) depends only on \( \nu \) and not on intensity, the correct answer is \( {(B)} \).