The half life of a radioactive substance is $20$ minutes. The approximate time interval $(t_2 -t_1)$ between the time $t_2$ when $3/4$ of it has decayed and time $t_1$ when $1/4$ of it had decayed is
The half life of a radioactive substance is $20$ minutes. The approximate time interval $(t_2 -t_1)$ between the time $t_2$ when $3/4$ of it has decayed and time $t_1$ when $1/4$ of it had decayed is
- A
$\frac{{20}}{{\ln 2}}\min$
- B
$\frac{{20\ln 3}}{{\ln 2}}\min$
- C
$20$ $min$
- D
$20\ln 2\min$
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- [AIPMT 1989]
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- [JEE MAIN 2023]