When a metallic surface is illuminated w...

When a metallic surface is illuminated with monochromatic light of wavelength X, the stopping potential is 5Vq. When the same surface is illuminated with light of wavelength 3X, the stopping potential is Then the work function of the metallic surface is

`(hc)/(6lambda)`

`(hc)/(5lambda)`

`(hc)/(4lambda)`

`(2hc)/(4lambda)`

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