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Grade 11Modern Physics

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

Profile image of Simran Bhatia
12 Years agoGrade 11
Answers icon

1 Answer

Profile image of Amit Saxena
12 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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