A radioactive sample with a half life of 1 month has the label: "Activity \( =2 \) micro curies ...

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A radioactive sample with a half life of 1 month has the label: "Activity \( =2 \) micro curies on 1.8.1991." What will be its activity two months later
[CBSE PMT 1992]
(a) \( 1.0 \) micro curies
(b) \( 0.5 \) micro curies
(c) 4 micro curies
(d) 8 micro curies
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