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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 1n 2

B

0.4 1n 2

C

0.2 1n 2

D

0.1 1n 2

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Verified by Experts

The correct Answer is:
B
(b) `lamda = (log _e (A_1)/(A_2))/(t) = (log_e (5000/1250))/(5) = 0.2 1n 2`.
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A2Z-NUCLEAR PHYSICS-Section D - Chapter End Test
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