Half life period of a radioactive substance is 60 days. time taken for frac{7}{8} th of its original

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13.Nuclei

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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 $......days$

A

$120$

B

$130$

C

$180$

D

$20$

(JEE MAIN-2022)

Solution

$7 / 8$ disintegrates means $1 / 8$ remains

$\operatorname{Or}\left(\frac{1}{2}\right)^{3}$

$\therefore 3$ half lives

$=180$ days

Standard 12

Physics

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