When radiation of the wavelength lamdais...

When radiation of the wavelength `lamda`is incident on a metallic surface ,the stopping potential is 4.8 V. If the same surface is illuminated with radiation of double the wavelength ,then the stopping potential becomes 1.6 V.Then the threshold wavelength for the surface is

`2lamda`

`4lamda`

`6lamda`

`8lamda`

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