JAMB Physics 2021 Objective — Question 1
Question 1 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2021 Objective paper, with the correct answer and a full explanation.
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The half life of a radioactive substances is 5 days. What percentage will remain after 20 days?
- A. 12.5%
- B. 25%
- C. 6.25%Correct
- D. 42%
Explanation
n=20/5=4 half-lives; (½)⁴=1/16=6.25%.
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