A radioactive sample with a half life of...

A radioactive sample with a half life of 1 month has the label : "Activity = 4 micro curie on 11-12-2013" . What will be activity after two months ?

8 micro curie

4 micro curie

1.0 micro curie

0.5 micro curie

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Verified by Experts

The correct Answer is:

2 months = 2 half lives
`therefore` In 2 months, the activity will be `1/2 (1/2) = 1/4`
Or `1/4` (4micro curie) = 1 micro curie

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