| 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 fs. The frequency of the sound measured by the observer is fo. Which of the following describes the relationship between fo and fs?
Markscheme
A
Examiners report
[N/A]
