Question

When a metal surface is illuminated with light of wavelength λ, the stopping potential is V₀. When the same surface is illuminated with light of wavelength 2λ, the stopping potential is V₀/4 . If the velocity of light in air is c, the threshold frequency of photoelectric emission is 

(a) c/6λ 

(b) c/3λ 

(c) 2c/3λ 

(d) 4c/3λ

Answer 1

Correct option (b)

Explanation:

According to Einstein’s photoelectric equation