BCECE Medical BCECE Medical Solved Papers-2012

  • question_answer
    Which one of the following graphs represents the graph between the instantaneous concentration (N) of a radioactive element and time (t)?

    A)   

    B)  

    C)   

    D)  

    Correct Answer: B

    Solution :

    By using, \[N={{N}_{0}}{{e}^{-\lambda t}}\] and \[\frac{dN}{dt}=-\lambda \,N\] It shows that N decreases exponentially with time.


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