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A photon colloides with a stationary hydrogen atom, in its ground state, inelastically. Energy of the colloiding photon is 10.2 eV. After a time interval, of the order of a microsecond, another photon colloides with the same hydrogen atom, inelastically, with an energy of 15 eV. A detector observes

(1) 2 photons of energy 10.2 eV

(2) 2 photons of energy 10.4 eV

(3) 1 photons of energy 10.2 eV and an electron of energy 1.4 eV

(4) 1 photons of energy 10.2 eV and another photon of energy 1.4 eV

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(3) 1 photons of energy 10.2 eV and an electron of energy 1.4 eV

The hydrogen atom, in its ground state, absorbs the incident photon of energy 10.2 eV and goes to its first excited state.

The atom remains in the excited state for a time of the order of 10-8 s. In one microsecond, it returns to its ground state, emitting a photon of energy 10.2 eV. Now the second photon, of (incident) energy 15 eV undergoes an inelastic collision with the same hydrogen atom. Out of 15 eV of energy, the atom recieves 13.6 eV are absorbed to knock out the electron from its ground state. The electron becomes free, i.e., hydrogen atom is ionised. The remaining energy, (15–13.6) = 1.4 eV is the kinetic energy of the electron knocked out of the hydrogen atom.

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