| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.SL.TZ1.23 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 23 | Adapted from | N/A |
Question
A freshly prepared sample contains 4.0 μg of iodine-131. After 24 days, 0.5μg of iodine-131 remain. The best estimate of the half-life of iodine-131 is
A. 8 days.
B. 12 days.
C. 24 days.
D. 72 days.
Markscheme
A
Examiners report
[N/A]
Syllabus sections
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