Dual Nature Of Light Question 245
Question: The work function of a metal is 4.2 eV, its threshold wavelength will be [BHU 2003; CPMT 2004]
Options:
A) 4000 Å
B) 3500 Å
C) 2955 Å
D) 2500 Å
Show Answer
Answer:
Correct Answer: C
Solution:
$ W_{0}(eV)=\frac{12375}{{\lambda_{0}}},\Rightarrow ,{\lambda_{0}}=\frac{12375}{4.2}\approx ,2955,{\AA} $
BETA
