Q 12-11-032JEE MainMedium
Photons of energy $5$ eV fall on a metal surface and the fastest photoelectrons are stopped by a potential of $2$ V. Find the work function of the metal in eV.
Numerical value type. Enter your answer.
Answer: 3
Concept. Einstein's equation: $\phi = E - eV_0$.
Step 1. Substitute. $5 - 2 = 3$ eV.
Answer. $3$.
Solution by Sreeraj P, M.Sc Physics