Question

Assertion : Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon.

Reason : The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

• A. Both assertion and reason are true and the reason is the correct explanation of the assertion.
• B. Both assertion and reason are true but reason is not the correct explanation of the assertion.
• C. Assertion is true but reason is false.
• D. Assertion and reason both are false.
• E. Assertion is false but reason is true.

Answer 1

The correct option is D

Assertion and reason both are false.

According Einstein equation $KE=hv-h{v}_0;$ i.e., KE depends upon the frequency. Photoelectron emitted only if incident frequency more than threshold frequency.