The half life of a radioactive substance is 20 minutes. The approximate time interval (t2 - t₁) between the time t₂ when of 23 \frac{2}{3} of it has decayed and the time t1 and 13 \frac{1}{3} of it had decayed is:

Question

The half life of a radioactive substance is 20 minutes. The approximate time interval (t2 - t₁) between the time t₂ when of   23 \frac{2}{3} of it has decayed and the time t1 and   13 \frac{1}{3}   of it had decayed is:

Accepted Answer

খ. 20 min

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