The rate of radioactive disintegration at an instant for a radioactive sample of half life \( 2....

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The rate of radioactive disintegration at an instant for a radioactive sample of half life \( 2.2 \times 10^{9} \mathrm{~s} \) is \( 10^{10} \mathrm{~s}^{-1} \). The number of radioactive atoms in the sample at that instant is,
(a) \( 3.17 \times 10^{20} \)
(b) \( 3.17 \times 10^{17} \)
(c) \( 3.17 \times 10^{18} \)
(d) \( 3.17 \times 10^{19} \)
 
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