Questions
A radioactive substance 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) is
detailed solution
Correct option is B
rate o disintegration is proportional to no of atoms present\then 50002n=1250 n=2 i.e, two half life time is 5 min T12=2.5 min0.693λ=2.5 ln2λ=2.5 then λ=ln 212.5=0.4ln2Talk to our academic expert!
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The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
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