| Date | May 2017 | Marks available | 1 | Reference code | 17M.1.SL.TZ2.25 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 25 | Adapted from | N/A |
Question
The half-life of a radioactive element is 5.0 days. A freshly-prepared sample contains 128 g of this element. After how many days will there be 16 g of this element left behind in the sample?
A. 5.0 days
B. 10 days
C. 15 days
D. 20 days
Markscheme
C
Examiners report
[N/A]
Syllabus sections
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