1.

If `3//4` quantity of a radioactive substance disintegrates in 2 hours, its half`-` life period will beA. `15 mi n`B. `30 mi n`C. `60 mi n`D. `90 mi n`

Answer» Correct Answer - C
`t_(3//4)=2t_(1//2)`
`:. t_(1//2)=(t_(3//4))/(2)=(2xx60)/(2)=60 mi n`


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