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A radioactive sample with a half-life of...

A radioactive sample with a half-life of `1` month has the label : 'Activity=
`2` microcurie on 1-8-1991'. What would be its avtivity two months earlier?

A

1.0 micro curie

B

0.5 micro curie

C

4 micro curie

D

8 micro curie

Text Solution

Verified by Experts

The correct Answer is:
D
In two half lives , the activity becomes one fourth . Activity on 1 - 8 - 91 was 2 micro-curie
`therefore` Activity before two months ,
`4 xx 2` micro-curie = 8 micro curie
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