The half life of a radioactive substance is $5$ years. After $x$ years a given sample of the radioactive substance gest reduced to $6.25 \%$ of its initial value of $x$ is ...............
The half life of a radioactive substance is $5$ years. After $x$ years a given sample of the radioactive substance gest reduced to $6.25 \%$ of its initial value of $x$ is ...............
- [JEE MAIN 2022]
- A
$20$
- B
$19$
- C
$21$
- D
$22$
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- [AIEEE 2012]
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