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

  • question_answer
    The half-life period of a radioactive substance is 8 years. After 16 years, the mass of the substance will reduce from starting \[16.0g\] to         [MP PMT 1999]

    A)                 \[8.0\,g\]            

    B)                 \[6.0\,g\]

    C)                 \[4.0\,g\]

    D)                 \[2.0\,g\]

    Correct Answer: C

    Solution :

      \[n=\frac{16}{8}=2,\,\,N=\frac{{{N}_{o}}}{{{2}^{n}}}=\frac{16.0}{{{2}^{2}}}=\frac{16.0}{4}=4.0\,gm.\]               


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