| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.HL.TZ1.33 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 33 | Adapted from | N/A |
Question
The half-life of a radioactive isotope is 10 days. What is the percentage of the sample remaining after 25 days?
A. 0 %
B. 18 %
C. 25 %
D. 40 %
Markscheme
B
Examiners report
[N/A]
Syllabus sections
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