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The half life of a radioactive substance is 20 minutes.

Question:

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

  1. $20 \mathrm{~min}$

  2. $28 \mathrm{~min}$

  3. $7 \mathrm{~min}$

  4. $14 \mathrm{~min}$


Correct Option: 1

Solution:

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