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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



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


Grade:11

1 Answers

Amit Saxena
35 Points
7 years ago

(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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