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1. A radioactive sample at any instant h...

1. A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute, After 5 minute, the rate is 1250 disintegrations per minute. The decay constant (per minute) is (1) 0.8 In 2 (2) 0.4 In 2 (3) 0.2 In 2 (4) 0.1 in 2

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