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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Rate of decay and Half-life

  • question_answer
    A radioactive isotope having a half-life of 3 days was received after 12 days. It was found that there were 3 gm of the isotope in the container. The initial weight of the isotope when packed was [NCERT 1980; CPMT 1999; KCET 2000; Pb.CET 2001]

    A)                 12 gm   

    B)                 24 gm

    C)                 36 gm   

    D)                 48 gm

    Correct Answer: D

    Solution :

           \[n=\frac{12}{3}=4\]                                 \ \[{{N}_{o}}=N\times {{2}^{n}}=3\times {{2}^{4}}=48g\].


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