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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Causes of radioactivity and Group displacement law

  • question_answer
    Initial mass of a radioactive element is 40 g. How many grams of it would be left after 24 years, if its    half-life period is 8 years     [MP PMT 1985]

    A)                 2             

    B)                 5

    C)                 10

    D)                 20

    Correct Answer: B

    Solution :

           \[N=\frac{{{N}_{o}}}{{{2}^{n}}}\] and \[n=\frac{24}{8}=3\]                                 \[N=\frac{40}{{{2}^{3}}}=\frac{40}{8}=5\]


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