Photoelectric emission is observed from ...

Photoelectric emission is observed from a metallic surface for frequencies `v_(1)` and `v_(2)` of the incident light rays `(v_(1) gt v_(2))`. If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of `1 : k` , then the threshold frequency of the metallic surface is

`(n_(1)-n_(2))/(k-1)`

`(kn_(1)-n_(2))/(k-1)`

`(kn_(2)-n_(1))/(k-1)`

`(n_(2)-n_(1))/(k)`

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