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A radioactive sample emit n beta - parti...

A radioactive sample emit `n beta` - particles is `2` sec , In next 2 sec it emits` 0.75 n beta`- particle , what is the mean life of the sample?

A

4s

B

2s

C

`(2)/((ln2))s`

D

`2(ln2)s`

Text Solution

Verified by Experts

The correct Answer is:
C
The half life of the radioactive substance is
`T_(1//2)=2s`
Mean life, `tua=(T_(1//2))/(ln2)=(2)/(ln2)s`
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