1.

At radioactive equilibrium, the ratio between two atoms a radioactive elements A and B is 3.1 ×109 : 1. If the half-life period of A is 2 × 1010 yrs, then the half-life of B is

A. 9.54 yrs
B. 2.14 yrs
C. 3.29 yrs
D. 6.45 yrs
Answer» E.


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