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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
    Half-life period of a metal is 20 days. What fraction of metal does remain after 80 days   [BHU 1996]

    A)                 1             

    B)                 1/16

    C)                 1/4        

    D)                 1/8

    Correct Answer: B

    Solution :

           \[T={{t}_{1/2}}\times n,\] \ \[n=\frac{80}{20}=4\]                                 Amount left \[=\frac{1}{{{2}^{n}}}=\frac{1}{{{2}^{4}}}=\frac{1}{16}\].


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