Sounds are produced by vibrating objects. A certain object vibrates but a human observer nearby cannot hear any sound.
Which statement could explain why nothing is heard?
The amplitude of the sound waves is too large.
The frequency of the vibration is below 20 Hz20\text{ Hz}20 Hz.
The sound waves are transverse.
The speed of the sound waves is too high.
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.