A sample of radioactive material A, that has an activity of 10 mCi (1 Ci = 3.7 × 10 10 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:
Text Solution
Verified by ExpertsThe correct answer is:
B
Activity A 
For A, 
For B, 
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