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JEE Main & Advanced Physics Atomic Physics Question Bank Atomic Structure

  • question_answer
    The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge [MP PMT 1987]

    A)            \[\frac{{{e}^{2}}}{{{r}^{2}}}\]

    B)            \[\frac{{{e}^{2}}}{2r}\]

    C)            \[\frac{{{e}^{2}}}{r}\]       

    D)            \[\frac{{{e}^{2}}}{2{{r}^{2}}}\]

    Correct Answer: B

    Solution :

                       Potential energy of electron in nth orbit of radius r in H-atom \[U=-\frac{{{e}^{2}}}{r}\] (in CGS)            ∵ K.E.\[=\frac{1}{2}|P.E.|\] Þ \[K=\frac{{{e}^{2}}}{2r}\]


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