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NEET Sample Paper NEET Sample Test Paper-25

  • question_answer
    The radioisotope tritium\[(\,_{1}^{3}H)\] has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?

    A)  1 mg

    B)  2 mg

    C)  4 mg

    D)  8 mg          

    Correct Answer: B

    Solution :

     \[T=49.2\,yr;\,{{t}_{1/2}}=12.3\]year \[\therefore \] \[n=4\] Now, \[N=\frac{{{N}_{0}}}{{{2}^{n}}}=\frac{32}{{{2}^{4}}}=2\,mg\]


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