Physics - Modern Physics Question with Solution | TestHub

When a$\mathrm{1 }\mathrm{c}\mathrm{m}$thick surface is illuminated with light of wavelength$\mathrm{\lambda }$, the stopping potential is${\mathrm{V}}_0$. When the same surface is illuminated by the light of wavelength$3\mathrm{\lambda }$, the stopping potential is$\frac{{\mathrm{V}}_0}{6}$. The threshold wavelength for the metallic surface is