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CMC Medical CMC-Medical Ludhiana Solved Paper-2013

  • question_answer
    A freshly prepared sample of yttrium-90 undergoes\[7.6\times {{10}^{5}}\]disintegration per minute at a certain time. Exactly 14 days later, same sample undergoes \[1.6\times {{10}^{4}}\]dpm. The half-life of yttrium-90 is

    A)  0.20 day             

    B)  2.5 day

    C)  2.7 day                

    D)  3.8 day

    Correct Answer: B

    Solution :

                    \[\lambda t=\log \frac{{{A}_{0}}}{A}\]\[\frac{\log 2\times 14}{log(7.6\times {{10}^{5}}/1.6\times {{10}^{4}})}={{t}_{1/2}}=2.5\,days\]


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