Physics - Modern Physics Question with Solution | TestHub

A certain metallic surface is illuminated by monochromatic radiation of wavelength $\lambda$. The stopping potential for photoelectric current for this radiation is$3{\mathit{ }\mathit{V}}_0.$If the same surface is illuminated with a radiation of wavelength$2\lambda ,$the stopping potential is$V_0.$The threshold wavelength of this surface for photoelectric effect is___________$\lambda .$