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A mixture consists of two radioactiv mat...

A mixture consists of two radioactiv materials `A_(1) and A_(2)` with half-lives of 20 s and 10 s, respectively. Initialy the mixture has 40 g of `A_(1) and 160` g of `A_(2).` The amount of the two in the mixture will become equal after

A

20 s

B

40 s

C

60 s

D

80 s

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The correct Answer is:
B
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