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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Rate of decay and Half-life

  • question_answer
    The half-life of \[C{{o}^{60}}\] is  7 years. If one \[gm\] of it decays, the amount of the substance remaining after 28 years  is [EAMCET 1992]

    A)                 \[0.25\,gm\]      

    B)                 \[0.125\,gm\]

    C)                 \[0.0625\,gm\] 

    D)                 \[0.50\,gm\]

    Correct Answer: C

    Solution :

              \[n=\frac{28}{7}=4,N=\frac{{{N}_{o}}}{{{2}^{n}}},N=\frac{1}{{{2}^{4}}}=\frac{1}{16}=0.0625\] gm.


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