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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 a radio isotope is 20 hours. After 60 hours, how much amount will be left behind [MP PMT 1991]

    A)                 1/8        

    B)                 1/4

    C)                 1/3        

    D)                 ½

    Correct Answer: A

    Solution :

              \[N=\frac{{{N}_{o}}}{{{2}^{n}}},n=\frac{60}{20}=3;{{N}_{o}}=1g,\] then \[N=\frac{1}{{{2}^{3}}}=\frac{1}{8}\].


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