When a surface 1 cm thick is illuminated...

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.

`4lamda`

`5lamda`

`3lamda`

`2lamda`

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