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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

0.8 In 2

B

0.4 In 2

C

0.2 In 2

D

0.1 In 2

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The correct Answer is:
B
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