When a metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential is V. If light of wavelength 2λ is used, the stopping potential is V/4. The threshold wavelength for the surface is
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When a metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential is V. If light of wavelength 2λ is used, the stopping potential is V/4. The threshold wavelength for the surface is