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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 ?
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- 1.0 micro curie
- 0.5 micro curie
- 4 micro curie
- 8 micro curie
Correct Option: D
In two half lives, the activity becomes one fourth.
Activity on 1–8–91 was 2 micro–curie
∴ Activity before two months,
4 × 2 micro-curie = 8 micro curie
