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A mixture consists of two radioactive materials `A_1` and `A_2` with half-lives of `20 s` and `10 s` respectively. Initially the mixture has `40 g` of `A_1` and `160 g` of `a_2`. The amount the two in the mixture will become equal after
A. 40 s
B. 60s
C. 80 s
D. 20 s

1 Answer

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Best answer
Correct Answer - A
(a) `40 rarr 20 rarr 10`
`160 rarr 80 rarr 40 rarr 10`
`t = 40 sec`.

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