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JCECE Medical JCECE Medical Solved Paper-2011

  • question_answer
    If \[{{N}_{0}}\]is the original mass of the substance of half-life period \[{{t}_{1/5}}=5yrs,\] 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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