Q. The light rays having photons of energy $1.8\ eV$ are falling on a metal surface having a work function $1.2\ eV.$ What is the stopping potential to be applied to stop the emitting electrons
A) $3\ eV$
B) $1.2\ eV$
C) $0.6\ eV$
D) $1.4\ eV$
Explanation
(c) Stopping potential $= 1.8eV - 1.2eV = 0.6\ eV$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.