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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2005

  • question_answer
    The half-life of a radio isotope is 5 yr. What fraction of this material would decay in 15 yr?

    A)  1                                            

    B)  ¾

    C)  7/8                                       

    D)  1/8

    Correct Answer: C

    Solution :

    Number of half lives \[=\frac{15}{5}=3yr\] So, after three half lives the decayed part of the radioactive material \[=1-{{\left( \frac{1}{2} \right)}^{3}}=\frac{7}{8}part\]


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