MHT CET 2025 Physics question
Photoelectric emission is observed from a metallic surface for frequencies and of the incident light rays (). 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 metallic surface is
Answer: (D)
Solution
By Einstein's equation . So and . Given , we get , i.e. . Rearranging,
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