Photoelectric emission is observed from a metallic surface for frequencies
Channel: Doubtnut
Date: 2020-01-19

`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