| Date | November 2011 | Marks available | 1 | Reference code | 11N.1.HL.TZ0.32 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 32 | Adapted from | N/A |
Question
The half-life of a radioactive nuclide is 20s. What fraction of the original sample will have decayed in one minute?
A. \(\frac{1}{8}\)
B. \(\frac{1}{4}\)
C. \(\frac{1}{2}\)
D. \(\frac{7}{8}\)
Markscheme
D
Examiners report
Far too many candidates selected response A, indicating that they had not carefully read the question.
Syllabus sections
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