A photon of energy 10.2eV collides inela...

A photon of energy 10.2eV collides inelastically with a stationary hydrogen atom in the ground state. After a time interval of the order of a microsecond, another photon collides with energy of 15eV. What will be observed by the detector ?

one photon of energy 10.2 eV and an electron having energy 1.4 eV

two photons of energy 1.4 eV

two photons of energy 10.2 eV

one photon of energy 10.2 eV and another photon of 1.4eV

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