| Date | November 2011 | Marks available | 1 | Reference code | 11N.1.HL.TZ0.16 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 16 | Adapted from | N/A |
Question
A fire engine with its siren sounding approaches and passes a stationary observer. The frequency of the sound emitted by the siren is \({f_s}\). The frequency of the sound measured by the observer is \({f_o}\). Which of the following describes the relationship between \({f_o}\) and \({f_s}\)?
Markscheme
A
Examiners report
[N/A]
