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Dual Nature Of Radiation

JEE Main 2021 (Online) 27th July Evening Shift

MCQ+4 / -12021
An electron and proton are separated by a large distance. The electron starts approaching the proton with energy 3 eV. The proton captures the electron and forms a hydrogen atom in second excited state. The resulting photon is incident on a photosensitive metal of threshold wavelength 4000\(\mathop A\limits^o\). What is the maximum kinetic energy of the emitted photoelectron?

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