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EAMCET Medical EAMCET Medical Solved Paper-2007

  • question_answer
    The fraction of element disintegrated after 4 half-lifes in percentage is

    A)  75%                                      

    B)  87.5%               

    C)  93.75%                                

    D)  92.5%

    Correct Answer: C

    Solution :

                     The amount of substance left after 4 half-lifes  is N. \[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{n}}=100{{\left( \frac{1}{2} \right)}^{4}}=6.25%\] \[\therefore \]  The fraction of element disintegrated \[={{N}_{0}}-N\] \[=100-6.25=93.75%\]


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