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

  • question_answer
    Radioactive lead \[_{82}P{{b}^{201}}\] has a half-life of 8 hours. Starting from one milligram of this isotope, how much will remain after 24 hours    [MP PMT 1990]

    A)                 \[1/2\ mg\]        

    B)                 \[1/3\,mg\] 

    C)                 \[1/8\,mg\]       

    D)                 \[1/4\,mg\]

    Correct Answer: C

    Solution :

              \[n=\frac{24}{8}=3,\,\,N=\frac{{{N}_{o}}}{{{2}^{n}}}=\frac{1}{{{2}^{3}}}=\frac{1}{8}mg\].


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