| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.HL.TZ2.32 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 32 | Adapted from | N/A |
Question
A radioactive substance S has a decay constant λS, substance T has a decay constant λT. Initially a sample of S contains NS nuclei and a sample of T contains NT nuclei. The initial activity of both samples is the same.
The ratio \(\frac{{{N_{\rm{S}}}}}{{{N_{\rm{T}}}}}\) is
A. 1
B. \(\frac{{{\lambda _{\rm{S}}}}}{{{\lambda _{\rm{T}}}}}\)
C. \(\frac{{{\lambda _{\rm{T}}}}}{{{\lambda _{\rm{S}}}}}\)
D. λSλT
Markscheme
C
Examiners report
Syllabus sections
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