An electronic device vibrates at a fixed frequency to produce sound waves in air. A person with normal hearing standing nearby cannot hear any sound.
Which statement could explain why no sound is heard?
The amplitude of the sound waves is too large.
The speed of the sound waves is too high.
The frequency of the vibration is less than 20 Hz20\text{ Hz}20 Hz.
The sound waves are longitudinal.
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.