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cse • paper_2 • quantum_mechanicscse-1989-subject-05-001

De Broglie wavelength — UPSC CSE 1989 Physics PYQ

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Photoelectron are liberated by ultraviolet light of wavelength 3000\text{ \AA} from a metallic surface for which the photoelectric threshold is at 4000\text{ \AA}. Calculate the De Broglie wavelength of electrons emitted with maximum kinetic energy.

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