# When a certain photosensitive surface is illuminated with monochromatic light of frequency v,

Question:

When a certain photosensistive surface is illuminated with monochromatic light of frequency $v$, the stopping potential for the photo current is $-\mathrm{V}_{0} / 2$. When the surface is illuminated by monochromatic light of frequency $v / 2$, the stoppoing potential is $-\mathrm{V}_{0}$. The threshold frequency for photoelectric emission is :

1. (1) $\frac{5 v}{3}$

2. (2) $\frac{4}{3} v$

3. (3) $2 v$

4. (4) None of the above

Correct Option: , 4

Solution:

(4)