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     EduGorilla 
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    At radioactive equilibrium, the ratio between two atoms of radioactive elements A and B is 3.1 × 109 : 1.  If t1/2  period of A is 2 × 1010 years. Calculate the half life period of B?

    Options :-

    1. 2 x 107 years
    2. 8.5 years
    3. 4 x 107 years
    4. 6.45 years
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