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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
    The half-life of \[_{38}^{90}Sr\] is 20 years. If its sample having initial activity of 8000 dis/min is taken, what would be its activity after 80 years                                     [MP PMT 2000]

    A)                 500 dis/min        

    B)                 800 dis/min

    C)                 1000 dis/min     

    D)                 1600 dis/min

    Correct Answer: A

    Solution :

           80 years = 4 half lives                                 Activity after n half lives \[=\frac{1}{{{2}^{n}}}\times a\].


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