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J & K CET Medical J & K - CET Medical 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 g. What mass of A and B are there in the sample after 4 days?

    A)  A = 3g, B = 9g

    B)  A = 6 g, B = 6 g

    C)  A = 12g, B = 0 g

    D)  A = 9g, B = 3g

    Correct Answer: A

    Solution :

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


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