MHT CET 2024 Physics question
When photons of energy fall on a photosensitive surface of work function , photoelectrons of maximum kinetic energy k are emitted. If the frequency of radiation is doubled, the maximum kinetic energy will be equal to (h= Planck's constant)
Answer: (D)
Solution
Einstein's photoelectric equation: , so . When the frequency is doubled the photon energy is and the new maximum kinetic energy is . So (which also equals ). Hence
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