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JEE Main & Advanced Physics Atomic Physics Question Bank Atomic Structure

  • question_answer
    An electron has a mass of \[9.1\times {{10}^{-31}}kg\]. It revolves round the nucleus in a circular orbit of radius \[0.529\times {{10}^{-10}}metre\]at a speed of \[2.2\times {{10}^{6}}m/s\]. The magnitude of its linear momentum in this motion is  [AFMC 1988]

    A)            \[1.1\times {{10}^{-34}}kg-m/s\]                                    

    B)            \[2.0\times {{10}^{-24}}kg-m/s\]

    C)            \[4.0\times {{10}^{-24}}kg-m/s\]                                    

    D)            \[4.0\times {{10}^{-31}}kg-m/s\]

    Correct Answer: B

    Solution :

                       Linear momentum \[=mv=9.1\times {{10}^{-31}}\times 2.2\times {{10}^{6}}\]            \[=2.0\times {{10}^{-24}}kg-m/s\]


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