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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

`60 s`

B

`80 s`

C

`20 s`

D

`40 s`

Text Solution

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The correct Answer is:
D
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