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A radioactive element has rate of disi...

A radioactive element has rate of disintegration `10,000` disintegrations per minute at a particular instant. After four minutes it becomes `2500` disintegrations per minute. The decay constant per minute is

A

`0.2log_e2`

B

`0.5log_e2`

C

`0.6log_e2`

D

`0.7log_e2`

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The correct Answer is:
B
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