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A sample of radioactive material A, that...

A sample of radioactive material A, that has an activity of `10 mCi(1 Ci=3.7xx10^(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 :

A

5 days and 10 days

B

10 days and 40 days

C

20 days and 5 days

D

20 days and 10 days

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