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MHT CET Physics question

PhysicsAtomsMHT CET

A beam of monochromatic light of wavelength ejects photoelectrons from a cesium surface ( eV) which are made to collide with hydrogen atoms in ground state. The maximum value of for which hydrogen atoms may be ionised is

Answer: (C)

Solution

To ionise hydrogen the photoelectron needs 13.6 eV, so the photon energy must be at least eV, giving

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Question ID VK-084814