Dual Nature Of Light Question 242
Question: A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is [MP PMT 1992]
Options:
A) 4.81 eV
B) 3.74 eV
C) 2.66 eV
D) 1.07 eV
Show Answer
Answer:
Correct Answer: C
Solution:
Energy of incident light $ E,(eV)=\frac{12375}{3320}=3.72,eV $ $ (332,nm=3320,{\AA}) $ According to the relation $ E=W_{0}+eV_{0} $
$ \Rightarrow V_{0}=\frac{(E-W_{0})}{e}=\frac{3.72,eV-1.07,eV}{e} $ $ =2.65Volt. $
BETA
