One mole of radium has an activity of $\frac{1}{3.7} \text{ kilo curie}$. Its decay constant is (Avogadro number $= 6 \times 10^{23} \text{ mol}^{-1}$)
- A$\frac{1}{6} \times 10^{-10} \text{ s}^{-1}$
- B$10^{-10} \text{ s}^{-1}$
- C$10^{-11} \text{ s}^{-1}$
- D$10^{-8} \text{ s}^{-1}$
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