Physics - Modern Physics Question with Solution | TestHub

When a metallic surface is illuminated with radiation of wavelength ' $\lambda$ ', the stopping potential is ' $\mathrm{V}$ '. If the same surface is illuminated with radiation of wavelength ' $2\lambda$ ', the stopping potential is ' $\left(\frac{\mathrm{v}}{4}\right)$,. The threshold wavelength for the metallic surface is