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JCECE Engineering JCECE Engineering Solved Paper-2011

  • question_answer
    If no is the original mass of the substance of half-life period\[{{t}_{1/5}}=5\,\,yrs\], then the amount of substance left after 15 days is

    A) \[\frac{{{N}_{0}}}{8}\]                                   

    B) \[\frac{{{N}_{0}}}{16}\]

    C)  \[\frac{{{N}_{0}}}{2}\]                                  

    D)  \[\frac{{{N}_{0}}}{4}\]

    Correct Answer: A

    Solution :

    \[N=\frac{N}{{{2}^{15/2}}}=\frac{{{N}_{0}}}{{{2}^{3}}}=\frac{{{N}_{0}}}{8}\]


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