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

  • question_answer
    The decay constant of radium is \[4.28\times {{10}^{-4}}\]per year. Its half life will be                                      [MNR 1990]

    A)            2000 years                             

    B)            1240 years

    C)            63 years                                 

    D)            1620 years

    Correct Answer: D

    Solution :

               \[T=\frac{0.6931\times 1}{\lambda }=\frac{0.6931\times 1}{4.28\times {{10}^{-4}}}year=1620\ years\]


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