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J & K CET Engineering J and K - CET Engineering Solved Paper-2003

  • question_answer
    A radioactive element A decays into B with a half-life of 2 days. A fresh prepared sample of A has a mass of \[12\text{ }g\]. What mass of A and B are there in the sample after 4 days?

    A)  \[~A=3g,B=9g\]

    B)  \[A=6g,B=6g\]

    C)  \[A=12g,B=0g\]

    D)  \[A=9g,B=3g\]

    Correct Answer: A

    Solution :

    After 2 days, we have \[A=6g,\,\,\,B=(12-6)g=6g\] After 4 days, we have \[A=3g,\,\,\,B=(12-3)g=9g\]


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