When a metallic surface is illuminated with radiation of wavelength `lambda`, the stopping potential is `V`. If the same surface is illuminated with radiation of wavelength `2 lambda` , the stopping potential is `(V)/(4)`. The threshold wavelength surface is :

When a metallic surface is illuminated with radiation of wavelength lambda , the stopping potentials is V. If the same surface is illuminated with radiation of wavelength 2 lambda , the stopping potential is ( V )/( 4) . The threshold wavelength for the metallic surface is

When a metallic surface is illuminated with radiation of wavelength lamda , the stopping poential is V. If the same surface is illuminated with radiation of wavelength 2lamda , the stopping potential is V/4 . The threshold wavelength for the metallic surface is

When a metallic surface is illuminated with radiation of wavelength lambda ,the stopping potential is V.If the same surface is illuminated with radiation of wavelength 2 lambda ,the metallic surface is

When a metallic surface is illuminated with radiation of wavelength lamda , the stopping potential is V . If the same surface is illuminated with radiation of wavelength 2lamda , the stopping potential is V/4 . The threshold wavelength for the metallic surface is

When a centimetre thick surfaces is illuminated with light of wavelength lambda , the stopping potential is V . When the same surface is illuminated by light of wavelength 2lambda , the stopping potential is V//3 . The threshold wavelength for the surface is: