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When a metallic surface is illuminated w...

When a metallic surface is illuminated with monochromatic light of wavelength `lambda` ,the stopping potential is `5V_(0)` .When the same surface is illuminated with light of wavelength `3 lambda` ,the stopping potential is `V_(0)` .The work function of the metallic surface is `(hc)/(n lambda)` .Find `n`?

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