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A mixture consists of two radioactive ma...

A mixture consists of two radioactive materials `A_1` and `A_2` with half lives of 20s and 10s respectively . Intially the mixture has 40g of `A_1` and 160 g of `A_2` . The amount of the two in the mixture will become equal after:

A

80s

B

20s

C

40 s

D

60s

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