1.

A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector                                [IIT-JEE (Screening) 2005]

A.            2 photon of energy 10.2 eV
B.            2 photon of energy of 1.4 eV
C.            One photon of energy 10.2 eV and an electron of  energy 1.4 eV
D.            One photon of energy 10.2 eV and another photon of 1.4 eV
Answer» D.            One photon of energy 10.2 eV and another photon of 1.4 eV


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