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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Radioactivity

  • question_answer
    If half-life of radium is 77 days. Its decay constant in day will be                                                  [BCECE 2005]

    A)            \[3\times {{10}^{-13}}\]/day 

    B)            \[9\times {{10}^{-3}}\]/day

    C)            \[1\times {{10}^{-3}}\]/day   

    D)            \[6\times {{10}^{-3}}\]/day

    Correct Answer: B

    Solution :

               \[\lambda =\frac{0.693}{{{T}_{1/2}}}=\frac{0.693}{77}\]\[=9\times {{10}^{-3}}/day\].


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