When radiation of wavelength \lambda is used to illuminate a metallic surface, the stopping potential is V. When the same surface is illuminated with radiation of wavelength 3\lambda, the stopping potential is V/4 . If the threshold wavelength for the metallic surface is n\lambda then value of n will be____________
Option: 1 9
Option: 2 6
Option: 3 3
Option: 4 12

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