A metallic surface is illuminated with r...

A metallic surface is illuminated with radiation of wavelength `lambda` the stopping potential is `V_o`. If the same surface is illuminated with radiation of wavelength `2lambda`., the stopping potential becomes `(V_o)/4`. The threshold wavelength for this metallic surface will be

3 `lambda`

3/2 `lambda`

4 `lambda`

`lambda`/4

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