A photon of energy $$10.2$$ eV collides inelastically with a hydrogen atom in ground state. After a certain time interval of few microseconds another photon of energy $$15.0$$ e V collides inelastically with the same hydrogen atom,then the observation made by a suitable detector is

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$$10.2$$ eV photon on collision will excite hydrogen atom to first excited state but hydrogen atom will return to ground state before next collision. For second photon $$15$$ eV > the ionization energy $$13.6$$ ev' The electron in the ground state n $$=$$ $$I)$$ is ionised and the excess energy $$15$$ eV $$-$$ $$13.6$$ eV $$=$$ $$1.4$$ eV appears as the kinetic energy of the electron.

A photon of energy 10.2 eV collides inelastically with a hydrogen atom in ground state. After a certain time interval of few microseconds another photon of energy 15.0 e V collides inelastically with the same hydrogen atom,then the observation made by a suitable detector is

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