| Date | November 2014 | Marks available | 1 | Reference code | 14N.1.HL.TZ0.14 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 14 | Adapted from | N/A |
Question
A source of sound moves away from an observer. The observed frequency of the sound differs from the frequency emitted by the source because the
A. observed wavelength of the sound is less than the emitted wavelength.
B. observed wavelength of the sound is greater than the emitted wavelength.
C. speed of sound relative to the observer has decreased.
D. speed of sound relative to the observer has increased.
Markscheme
B
Examiners report
[N/A]
