| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.HL.TZ0.17 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 17 | Adapted from | N/A |
Question
A siren on an ambulance emits sound of frequency f. The speed of sound in still air is v. What is the frequency of the sound observed when the ambulance travels at speed \(\frac{v}{{10}}\) towards a stationary observer?
A. \(\frac{f}{{10}}\)
B. f
C. \(\frac{{11}}{{10}}f\)
D. \(\frac{{10}}{{9}}f\)
Markscheme
D
Examiners report
[N/A]
