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A radioactive sample at any instant has ...

A radioactive sample at any instant has its disintegration ratye `5000` disintegrations per minute After `5` minutes , the rate is `1250` disintegration per Then , the decay constant (per minute)

A

`0.4 in 2`

B

`0.2 in 2`

C

`0.1 in 2`

D

`0.8 in 2`

Text Solution

Verified by Experts

The correct Answer is:
A

`lambda = (1)/(t) log_(e) (A_(0))/(A) = (1)/(5) log _(e) (5000)/(1250) = 0.4 log _(e) 2 `
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