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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 would be its activity two months earlier?
(a) 1. 0 micro curie
(b) 0.5 micro curie
(c) 4 micro curie
(d) 8 micro curie
(d)
In two half lives, the activity becomes one fourth.
Activity on 1-8-91 was 2 micro-curie
.''. Activity before two month''s,
4 × 2 micro-curie = 8 micro curie
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