| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ1.32 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 32 | Adapted from | N/A |
Question
A radioactive sample of initial activity 12.0Bq has a half-life of 3.0 days. Which of the following is the activity after 4.0 days?
A. 3.0 Bq
B. 3.8 Bq
C. 4.0 Bq
D. 4.8 Bq
Markscheme
D
Examiners report
Teachers objected to this question as there was no exact answer; however the rubric for Paper 1 invites the candidates to choose the best answer. They should be able to estimate and make approximations. In this case the best answer is obvious from a quick sketch graph. It is not necessary to use a calculator.
Syllabus sections
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