Post-UTME Physics 2015 Objective — Question 3
Question 3 of 20 from the Post-UTME Screening (Post-UTME) Physics 2015 Objective paper, with the correct answer and a full explanation.
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A radioactive material has a half-life of 15 minutes. What fraction of the initial mass of the material will be left after one hour?
- A. 1/12
- B. 1/4
- C. 1/16Correct
- D. 1/8
Explanation
One hour = 60 minutes = 4 half-lives. Fraction remaining = (1/2)^4 = 1/16.
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