The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.
A. 2.17V B. 1.49V C. 1.09V D. 0.34V
Correct Answer: D
Explanation
The stopping potential is the potential required to stop the most energetic photo-emitted electron. From the relation e Vs = K.E,(max) where e is the electron charge, and Vs is the stopping potential => e x Vs = 0.34eV ∴ Vs = (0.34eV) / e = 0.34V ∴ stopping potential = 0.34V
