The half life of a radioactive sample undergoing α – decay is 1.4×1017 s. If the number of nuclei in the sample is 2.0×1021,the activity of the sample is nearly
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a
103 Bq
b
104 Bq
c
105 Bq
d
106 Bq
answer is B.
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Detailed Solution
The activity (A) is defined as the rate of decay of radioactive substance.A=−dNdt=NλA=N×0.693T [T is half life ]A=2×1021×0.6931.4×1017A=104Bq
The half life of a radioactive sample undergoing α – decay is 1.4×1017 s. If the number of nuclei in the sample is 2.0×1021,the activity of the sample is nearly