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A radioactive element decays by beta-emi...

A radioactive element decays by `beta-`emission. A detector racords `n`-beta particles in `2` sec and in next `2` sec it records `0.65n`-beta particles. Find mean life.

A

4 s

B

2 s

C

`(2)/((In 2))s`

D

2 (In 2)s

Text Solution

Verified by Experts

The correct Answer is:
C
The half-life of radioactive substance is `T_(v2)=2s`
Mean life, `lamda=(T_(1//2))/("in" 2)=2/("in"2)s`
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