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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` of it has decayed and time `t_(1)` when `1/3` of it had decayed is

A

14 min

B

20 min

C

28 min

D

7 min

Text Solution

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The correct Answer is:
B
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