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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 minute, the rate 1250 disintegration per minute. The decay constant (per minute) is

A

0.4 ln2

B

0.2 ln2

C

0.1 ln2

D

0.8 ln2

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The correct Answer is:
A
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