What is the disintegration constant of radon, if the number of its atoms diminishes by \( 18 \% ...

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What is the disintegration constant of radon, if the number of its atoms diminishes by \( 18 \% \) in \( 24 \mathrm{~h} \) ?
(a) \( 2.1 \times 10^{-3} \mathrm{~s}^{-1} \)
(b) \( 2.1 \times 10^{-4} \mathrm{~s}^{-1} \)
(c) \( 2.1 \times 10^{-5} \mathrm{~s}^{-1} \)
(d) \( 2.1 \times 10^{-6} \mathrm{~s}^{-1} \)
\( \mathrm{P} \)
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