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When a surface 1cm thick is illuminated ...

When a surface `1cm` thick is illuminated with light of wave length `lambda` the stopping potential is `V_(0)`, but when the same surface is illuminated by light of wavelength `3 lambda`, the stopping potential is `V_(0)/6`. The threshold wavelength for matellic surface is:

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When a surface 1 cm thick is illuminated with light of wavelength lambda , the stopping potential is V_(0) , but when the same surface is illuminated by light of wavelength 3lambda , the stopping potential is (V_(0))/(6) . Find the threshold wavelength for metallic surface.

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