The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8}$ th of its original mass to disintegrate will be $......days$
The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8}$ th of its original mass to disintegrate will be $......days$
- [JEE MAIN 2022]
- A
$120$
- B
$130$
- C
$180$
- D
$20$
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- [JEE MAIN 2021]
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