Physics · 2012
NEET 2012 · Prelims · Code A · Q45
A mixture consists of two radioactive materials A_1 and A_2 with half lives of 20s and 10s respectively. Initially the mixture has 40 g of A_1 and…
A mixture consists of two radioactive materials $\displaystyle \mathrm{A}_1$ and $\displaystyle \mathrm{A}_2$ with half lives of 20s and 10s respectively. Initially the mixture has $\displaystyle 40$ g of $\displaystyle \mathrm{A}_1$ and 160g of $\displaystyle \mathrm{A}_2$. The amount of the two in the mixture will become equal after :
Official answer
(2)
$\displaystyle 40$ s
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