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CSE · Paper II · Quantum Mechanicscse-1989-subject-05-001

De Broglie wavelength — UPSC Physics Optional CSE 1989 Paper II

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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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