Dual Nature Of Light Question 319

Question: The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be [BHU 2003]

Options:

A) 2900 Å

B) 2500 Å

C) 5380 Å

D) 2000 Å

Show Answer

Answer:

Correct Answer: C

Solution:

$ W_{0}=\frac{12375}{2.3}=5380{\AA} $ .