A radioactive sample at any instant has its disintegration rate 5000 dpm . After 5 minutes , the rate is 1250 dpm . Then, the decay constant (per minute) is

Question

A radioactive sample at any instant has its disintegration rate 5000 dpm . After 5 minutes , the rate is 1250 dpm . Then, the decay constant (per minute) is, 0.8 l n 2, 0.4 l n 2, 0.2 l n 2, 0.1 l n 2

MARKS App · Accepted Answer

1250 5000 = 1 2 n n = 2 T 1 2 = t n = 5 2 = 2.5 m i n decay constant , λ = l n 2 T 1 2 = l n 2 2.5 = 0.4 l n 2

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