Question

A photon having energy 5.5 eV is incident on metal suface and emits photo electrons having maximum kinetic energy 0.4 eV. Then stopping potential of this electron is……….. 

(A) 5.5 eV 

(B) 5.1 eV 

(C) 5.9 eV 

(D) 0.4 eV

Answer 1

The correct option is (D) 0.4 eV.

Explanation:

Maximum Kinetic energy = eV_stopping

∴ 0.4 eV = eV_stopping

∴ V_stopping = 0.4 eV