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A sample of radioactive material \( A \), that has an activity of 10 \( \mathrm{mCi}\left(1 \mathrm{Ci}=3.7 \times 10^{10}\right. \) decays \( \left./ \mathrm{s}\right) \) has twice the number of nuclei as another sample of a different radioactive material
\( \mathrm{P} \) \( B \) which has an activity of \( 20 \mathrm{mCi} \). The correct choices for

W half-lives of \( A \) and \( B \) would, then be respectively
(Main 2019, 9 Jan I)
(a) 20 days and 10 days
(b) 5 days and 10 days
(c) 10 days and 40 days
(d) 20 days and 5 days
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