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A and B are two radioactive substances w...

A and B are two radioactive substances whose half-lives are 1 and 2 yr respectively. Initially 10 g of A and 1 g of B is taken. The time (approximately) after which we will have same quantity remaining is:

A

6.65 yr

B

5 yr

C

3.2 yr

D

7 yr

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The correct Answer is:
A
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