The half life of a radioactive substance is 20 minutes. The approximate time interval (t₂ - t₁) between the time t₂ when 2/3 of it had decayed and time t₁ when 1/3 of it had decayed is:

Atoms and Nuclei: JEE Main 2011 Physics question

JEE Main 2011 · Annual, Paper 1 · Q6083

JEE Main 2011Annual, Paper 1PhysicsMediumAtoms and Nuclei183× since 2002

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

{2 \over 3}

of it had decayed and time

{{t_1}}

when

{1 \over 3}

of it had decayed is :

JEE Main 2011 · Annual, Paper 1 · Q6083

JEE Main 2011Annual, Paper 1PhysicsMediumAtoms and Nuclei183× since 2002

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

{2 \over 3}

of it had decayed and time

{{t_1}}

when

{1 \over 3}

of it had decayed is :