| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.HL.TZ0.33 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 33 | Adapted from | N/A |
Question
The decay constant is the probability of the
A. number of radioactive decays per unit time.
B. decay of a nucleus per unit time.
C. decay of a nucleus.
D. number of nuclei decaying in any given time.
Markscheme
B
Examiners report
There was a fairly even split between response A and B for this question. This may have been caused by candidates either not reading the responses carefully enough or not appreciating the difference between the two.
Syllabus sections
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