A musician plays a sustained note on a keyboard. A listener notices that, although the pitch of the note remains constant, the volume (loudness) of the sound varies.
Which row in the table correctly describes the amplitude and the frequency of the sound wave?
| Amplitude | Frequency | |
|---|---|---|
| A | constant | constant |
| B | constant | varying |
| C | varying | constant |
| D | varying | varying |
Amplitude: constant; Frequency: constant
Amplitude: constant; Frequency: varying
Amplitude: varying; Frequency: constant
Amplitude: varying; Frequency: varying
295 exam-style questions on CIE IGCSE Physics Sound, covering Sound. Each one has a worked solution and a mark scheme showing where the marks go.