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AMU Medical AMU Solved Paper-1996

  • question_answer
    A freshly prepared radioactive sample of half life 2 hours emits radiations of intensity that is 64 times the permissible safe limit. The minimum time after which it would be possible to work safely with this source is

    A)  36 hours         

    B)  24 hours

    C)  12 hours         

    D)  10 hours

    Correct Answer: C

    Solution :

    : \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{t/T}}\] \[\frac{1}{64}={{\left( \frac{1}{2} \right)}^{t/2}}\] or \[{{\left( \frac{1}{2} \right)}^{6}}={{\left( \frac{1}{2} \right)}^{t/2}}\] or \[\frac{t}{2}=6\] or \[t=12\]hours.


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