WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    \[{{\text{C}}^{\text{14}}}\] has half-life 5700 yr. At the end of 11400 yr, the actual amount left is

    A)  0.5 of original amount

    B)  0.25 of original amount

    C)   0.125 of original amount

    D)  0.0625 of original amount

    Correct Answer: B

    Solution :

                     \[N={{N}_{0}}\times {{\left( \frac{1}{2} \right)}^{11400/5700}}\] \[={{N}_{0}}{{\left( \frac{1}{2} \right)}^{2}}=0.25{{N}_{0}}\]


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