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