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}
Einstein's photoelectric equation states: \[ K_{{max}} = hu - W_0 \] where \( h \) is Planck’s constant, \( u \) is the incident light's frequency, and \( W_0 \) is the metal's work function. 
Step 2: {Dependence on Frequency} 
As \( K_{{max}} \) is solely dependent on \( u \) and independent of intensity, \( {(B)} \) is the correct selection.