MHT CET 2025 Physics question
When a light of wavelength falls on the emitter of a photocell, maximum speed of emitted photoelectrons is V. If the incident wavelength is changed to , maximum speed of emitted photoelectrons will be
Answer: (D)
Solution
Einstein's photoelectric equation: . Taking the kinetic energy to be governed by the photon energy (work function negligible, as the question gives no value for it), , so . Then $ =
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