A radioactive sample with a half-life of 1 month has the label: "Activity=2 micro curies on 1-8-1991." What will be its activity two months later?
Correct answer: A. 0.5 micro curies
- A. 0.5 micro curies
- B. 8 micro curies
- C. 1 micro curies
- D. 2 micro curies
Explanation
Option A is correct since if the initial activity is two curies, and the half-life is 1 month, then after 2 months the activity will reduce from 2 to 1 to 0.5 microcuries.Option B is incorrect since it shows an increase in activity which is not the case for a radioactive sample after a certain number of half-lives.Option C is incorrect since it shows the activity after only one half-life.Option D is incorrect since it shows that the activity did not change, which is not the case.
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