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Physics · 2016
JEE Main 2016 · 2016-04-03 Offline · Q22
Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes, respectively. Initially, the samples have equal number of nuclei. After…
Half-lives of two radioactive elements A and B are $\displaystyle 20$ minutes and $\displaystyle 40$ minutes, respectively. Initially, the samples have equal number of nuclei. After $\displaystyle 80$ minutes, the ratio of decayed numbers of A and B nuclei will be :
Official answer
(4)
$\displaystyle 5$ : $\displaystyle 4$
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