Physics - Modern Physics Question with Solution | TestHub

When a metallic surface is illuminated with monochromatic light of wavelength$\mathrm{\lambda }$, stopping potential for photoelectric current is$3{\mathrm{V}}_0$. When the same metallic surface is illuminated with a light of wavelength$2\mathrm{\lambda }$, the stopping potential is${\mathrm{V}}_0$. The threshold wavelength for the surface is