Dual Nature Of Light Question 259
Question: Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wave length of photo ? electrons is 5420 Å. The work function of sodium is [MP PMT 1993; Pb. PMT 2002]
Options:
A) 4.58 eV
B) 2.29 eV
C) 1.14 eV
D) 0.57 eV
Show Answer
Answer:
Correct Answer: B
Solution:
$ W_{0}=\frac{12375}{{\lambda_{0}}({\AA})}=\frac{12375}{5420}=2.28,eV $
BETA
