Post-UTME Physics 2011 Objective — Question 10
Question 10 of 10 from the Post-UTME Screening (Post-UTME) Physics 2011 Objective paper, with the correct answer and a full explanation.
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After three half-lives, the fraction of a radioactive material that has decayed is
- A. 1/8
- B. 1/3
- C. 2/3
- D. 7/8Correct
Explanation
Remaining fraction=(½)³=1/8, so decayed fraction=1-1/8=7/8.
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