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When radiation of wavelength `lambda` is used to illuminate a metallic surface , the stopping potential is V. When the same suface is illuminated with radiation of wavelength `3 lambda` the stopping is `V/4` . If the therehold wavelength for the metallic

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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

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