BCECE Engineering BCECE Engineering Solved Paper-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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