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JEE Main & Advanced Physics Atomic Physics Question Bank Atomic Structure

  • question_answer
    If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of \[L{{i}^{++}}\] is                                                      [AIEEE 2003]

    A)            122.4 eV                                 

    B)            30.6 eV

    C)            13.6 eV                                   

    D)            3.4 eV

    Correct Answer: B

    Solution :

               \[{{E}_{n}}=\frac{13.6}{{{n}^{2}}}\times {{Z}^{2}}.\]For first excited state n = 2 and for \[L{{i}^{++}},\ z=3\]Þ \[E=\frac{13.6}{4}\times 9=30.6\ eV\]


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