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JEE Main & Advanced Physics Atomic Physics Question Bank Self Evaluation Test - Atoms

  • question_answer
    Energy required for the electron excitation in \[L{{i}^{+}}\] from the first to the third Bohr orbit is:

    A)  36.3 eV

    B)  108.8 eV

    C)  122.4eV

    D)  12.1 eV

    Correct Answer: B

    Solution :

    [b] Energy of excitation, \[\Delta E=13.6{{\pi }^{2}}\left( \frac{1}{{{\eta }_{1}}}-\frac{1}{{{\eta }_{2}}} \right)eV\] \[\Rightarrow \Delta E=13.6{{\left( 3 \right)}^{2}}\left( \frac{1}{{{1}^{2}}}-\frac{1}{{{3}^{2}}} \right)=108.9eV\]


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