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

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

  1. A

    103 Bq

  2. B

    104 Bq

  3. C

    105 Bq

  4. D

    106 Bq

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    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

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