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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    A freshly prepared radioactive source of half-life 2h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with source is:

    A)  \[6h\]                          

    B)  \[12h\]

    C)  \[24h\]                        

    D)  \[128h\]

    Correct Answer: B

    Solution :

    Number of half-life after which intensity of radiation becomes \[\frac{1}{64}\] of initial is given by \[\frac{1}{64}={{\left( \frac{1}{2} \right)}^{n}}\]             \[\Rightarrow \]                \[n=6\] Required time \[=6\times 2=12h\]


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