1.

When a centimeter thick surface is illuminated with light of wavelength λ the stopping potential is V. When the same surface is illuminated by light of wavelength 2λ the stopping potential is V3. The threshold wavelength for the surface is-

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When a centimeter thick surface is illuminated with light of wavelength λ the stopping potential is V. When the same surface is illuminated by light of wavelength 2λ the stopping potential is V3. The threshold wavelength for the surface is-



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