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A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state

A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state after few microseconds another photon of energy 15 eV collides inelastically with same hydrogen atom. Finally by a suitable detector we find

Options

(a) photon of energy 3.4 eV and electron of energy 1.4 eV
(b) photon of energy 10.2 eV and electron of energy 1.4 eV
(c) two photons of energy 3.4 eV
(d) two photons of energy 10.2 eV

Correct Answer:

photon of energy 10.2 eV and electron of energy 1.4 eV

Explanation:

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