Physics - Modern Physics Question with Solution | TestHub

When a certain metal surface is illuminated with light of frequency $v$, the stopping potential for photoelectric current is ${\mathrm{V}}_0$. When the same surface is illuminated by light of frequency $\frac{v}{2}$, the stopping potential is $\frac{{\mathrm{V}}_0}{4}$, the threshold frequency of photoelectric emission is