A mixture consists of two radioactive materials \( A_{1} \) and \( A_{2} \) with half lives of \...

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A mixture consists of two radioactive materials \( A_{1} \) and \( A_{2} \) with half lives of \( 20 \mathrm{~s} \) and \( 10 \mathrm{~s} \) respectively. Initially the mixture has \( 40 \mathrm{~g} \) of \( A_{1} \) and \( 160 \mathrm{~g} \) of \( A_{2} \). The amount of the two in the mixture will become equal after [CBSE PMT (Pre.) 2012]
(a) \( 60 s \)
(b) \( 80 s \)
(c) \( 20 s \)
(d) \( 40 s \)
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