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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Radioactivity

  • question_answer
    Carbon \[-14\]decays with half-life of about 5,800 years. In a sample of bone, the ratio of carbon \[-14\]to carbon \[-12\]is found to be \[\frac{1}{4}\] of what it is in free air. This bone may belong to a period about x centuries ago, where x is nearest to [KCET 1994]

    A)            \[2\times 58\]

    B)            58

    C)            58/2                                         

    D)            \[3\times 58\]

    Correct Answer: A

    Solution :

                       To becomes \[\frac{1}{4}\]th, it requires time of two half lives            \[i.e.,t=2({{T}_{1/2}})=2\times 5800=2\times 58\]centuries


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