Post-UTME Physics 2009 Objective — Question 2
Question 2 of 10 from the Post-UTME Screening (Post-UTME) Physics 2009 Objective paper, with the correct answer and a full explanation.
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The half life of an element is 12hrs. If the initial mass is 50g. What mass will be left after 2 days?
- A. 3.125gCorrect
- B. 6.25g
- C. 12.5g
- D. 25g
Explanation
2 days = 48 hours = 4 half-lives. Remaining mass = 50 x (1/2)^4 = 50/16 = 3.125g.
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