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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 substance has \[{{t}_{1/2}}\]60 minutes. After 3 hrs, what percentage of radioactive substance will remain [BHU 1995]

    A)                 50%       

    B)                 75%

    C)                 25%       

    D)                 12.5%

    Correct Answer: D

    Solution :

              Amount left \[=\frac{{{N}_{o}}}{{{2}^{3}}}=\frac{100}{8}=12.5%\]


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