A sample of radioactive material A, that has an activity of 10 mCi (1 Ci = 3.7 × 1010 decays/s), has twice the number of nuclei as another sample of a different radioactive material B which has an activity of 20 mCi. The correct choices for half-lives of A and B would then be respectively:

A sample of radioactive material A, that has an activity of 10 mCi (1

1.	A sample of radioactive material A, that has an activity of 10 mCi (1 Ci = 3.7 × 1010 decays/s), has twice the number of nuclei as another sample of a different radioactive material B which has an activity of 20 mCi. The correct choices for half-lives of A and B would then be respectively:
A.	5 days and 10 days
B.	10 days and 40 days
C.	20 days and 5 days
D.	20 days and 10 days
Answer» D. 20 days and 10 days

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A sample of radioactive material A, that has an activity of 10 mCi (1 Ci = 3.7 × 1010 decays/s), has twice the number of nuclei as another sample of a different radioactive material B which has an activity of 20 mCi. The correct choices for half-lives of A and B would then be respectively:

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