| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ1.17 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 17 | Adapted from | N/A |
Question
During a journey an observer travels at constant speed towards, and then goes beyond, a stationary emitter of sound.
The frequency of the sound as measured at the emitter is \(f\). The frequency according to the observer
A. is always greater than \(f\).
B. is always equal to \(f\).
C. is always less than \(f\).
D. varies during the journey.
Markscheme
D
Examiners report
[N/A]
