A sample of radioactive material \( A \), that has an activity of \( 10 \mathrm{mCi} \quad\left(...

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A sample of radioactive material \( A \), that has an activity of \( 10 \mathrm{mCi} \quad\left(\left(1 \mathrm{Ci}=3.7 \times 10^{10}\right.\right. \) decays/s), has twice the number of nuclei as another sample of a different radioactive maternal \( B \) which has an activity of \( 20 \mathrm{mCi} \). The correct choices for hall-lives of \( A \) and \( B \) would then be respectively
[JEE (Main) 2019]
(a) 10 days and 40 days
(b) 20 days and 5 days
(c) 5 days and 10 days
(d) 20 days and 10 days
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