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A radioactive sample at any instant has ...

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

A

`0.4ln2`

B

`0.1ln2`

C

`0.1ln2`

D

`0.8ln2`

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