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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2000

  • question_answer
    If half life of a substance is 38 days and its quantity is 10.38 g. Then quantity remaining left after 19 days will be:

    A)  0.151 g                                

    B)  0.32g

    C)  0.51g                   

    D)         0.16g

    Correct Answer: B

    Solution :

    Remaining quantity \[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/{{t}_{1/2}}}}\] \[N=10.38{{\left( \frac{1}{2} \right)}^{10/3.8}}\] \[=10.38{{\left( \frac{1}{2} \right)}^{5}}=\frac{10.38}{32}=0.32g\]


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