When a metalic surface is illuminated with light of wavelength `lambda,` the stopping potential is V. the same surface is illuminated by light of wavelength `2lambda` the stopping potential is `(V)/(3)` The thershold waelength for the 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:

When a centimeter thick surface is illuminated with light of wavelength lamda , the stopping potential is V. When the same surface is illuminated by light of wavelength 2lamda , the stopping potential is (V)/(3) . Threshold wavelength for the metallic surface is

When a centimeter thick surface is illuminated with light of wavelength lamda , the stopping potential is V. When the same surface is illuminated by light of wavelength 2lamda , the stopping potential is (V)/(3) . Threshold wavelength for the metallic surface is

When a photosensitive surface is illuminated with light of wavelenght lambda , the stopping potential 74 is V. When the same surface is illuminated by light of wavelength 2lambda , stopping potential is V/4. The threshold wavelength for the surface is N lambda then N will be ,-

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 :