The disintegration constant of radium with a half-life of $1600 \ years$ is:
- A$2.12 \times 10^{-4} \ year^{-1}$
- B$4.33 \times 10^{-4} \ year^{-1}$
- C$3.26 \times 10^{-3} \ year^{-1}$
- D$4.33 \times 10^{-12} \ year^{-1}$
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