Dual Nature Of Light Question 276
Question: The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately [IIT JEE 1998; UPSEAT 2002, 03; AIEEE 2004]
Options:
A) 540 nm
B) 400 nm
C) 310 nm
D) 220 nm
Show Answer
Answer:
Correct Answer: C
Solution:
$ {\lambda_{0}}=\frac{hc}{W_{0}}=\frac{12400}{4}=3100{\AA}=310\ nm $
BETA
