1.

When light of wavelength λ is incident on a metal surface ,stopping potential is found to be V_circ . When light of wavelength nλ is in incident on the same metal surface ,stopping potential is found to be V_circ/(n+1). The threshold wavelength of the metal is

Answer»

`n^3λ`
`λ/n^2`
`n^2λ`
`(n+2)λ`

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