AIPMT PRELIMS 2012 Physics Radioactive Decay MCQ Question
A mixture consists of two radioactive materials A₁ and A₂, with half lives of 20 s and 10 s respectively. Initially the mixture has 40 g of A₁ and 160 g of A₂. The amount of the two in the mixture will become equal after
40 s
60 s
80 s
20 s
Correct Answer
Detailed Explanation
The decay of radioactive materials follows an exponential law. By calculating the remaining amounts of A₁ and A₂ after each half-life, they become equal after 40 seconds.
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