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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 becomes 1250 disintegration per minute. Then its decay constant (per minute) is

A

(a) `0.8 log_e 2`

B

(b) `0.4 log_e 2`

C

(c) `0.2 log_e 2`

D

(d) `0.1 log_e 2`

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The correct Answer is:
B
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