MHT CET 2026 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 k : 1, then what is the threshold frequency of the metallic surface?
Answer: (D)
Solution
By Einstein's photoelectric equation . For the two frequencies, and (the ratio of the kinetic energies is ). Dividing, , so , giving
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