An electron collides with a hydrogen atom in its ground state and excites it to n = 3 . The energy given to hydrogen atom in this inelastic collision is(neglect the motion of hydrogen atom)

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The energy taken by hydrogen atom corresponds to its transition from n = 1 to n = 3 state. ∆ E ( g i v e n t o h y d r o g e n a t o m ) = 13.6 1 - 1 9 = 13.6 × 8 9 = 12.1 eV

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