Q 12-13-073JEE MainJEE Main 2023 (10 Apr, Shift 2)Easy
The half life of a radioactive substance is $T$. The time taken for disintegrating $\dfrac78$ part of its original mass will be
Answer: (B) $3T$
$\dfrac18$ remaining means $3$ half-lives: $3T$.
Solution by Sreeraj P, M.Sc Physics