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A radioactive sample with a half-life of 1 month has the label: activity =2 microcuries on 1-8-1991. What would be its activity two months earlier?
1.0 micro curie
4 micro curie
0.5 micro curie
8 micro curie

A

8 micro curie

B

4 micro curie

C

1.0 micro curie

D

0.5 micro curie

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