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At radioactive equilibrium, the ratio be...

At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : 1`. If the half-life period of `A` is `2 xx 10^(10)` years, what is the half-life of `B`?

A

6.45 yrs

B

4.65 yrs

C

5.46 yrs

D

5.64 yrs

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