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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2011

  • question_answer
        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 recoiling of hydrogen atom]

    A)  10.2 eV               

    B)  12.1 eV

    C)  12.5 eV               

    D)  None of these

    Correct Answer: B

    Solution :

                    The energy taken by hydrogen atom corresponds to its transition from\[n=1\]to\[n=3\]state. \[\Delta E=13.6\left( 1-\frac{1}{9} \right)\]                 \[=13.6\times \frac{8}{9}=12.1\,eV\]


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