Questions
After 280 days, the activity of a radioactive sample is 6000 dps. The activity reduces to 3000 dps after another 140 days. The initial activityof the sample in dps is
detailed solution
Correct option is D
Here the activity of the radioactive sample reduces to half in 140 days. Therefore, the half-life of the sample is 140 days. 280 days is its two half -lives. So before two half-lives its activity was (22 x present activity)∴Initial activity= 22 x 6000 = 24000 dps.Talk 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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