RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    What will be the percentage of radioactive material after 5 half- life?

    A)  31%              

    B)  3.125%

    C)  0.3%             

    D)  1%

    Correct Answer: B

    Solution :

     \[N=\frac{{{N}_{0}}}{{{2}^{5}}}=\frac{{{N}_{0}}}{32}\] \[=3.125%\]of \[{{N}_{0}}\]


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