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The half-life of a radioactive substance...

The half-life of a radioactive substance is 20 min. The approximate time interval `(t_2-t_1)` between the time `t_2` when `2/3`rd of its has decayed and time `t_1` when `1/3`rd of it had decayed is -

(A) 14 min
(B) 20 min
(C) 28 min
(D) 7 min

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