A device is designed to vibrate and produce sound waves. Even though the device is operating normally, a person with healthy hearing standing nearby cannot hear any sound. Which statement could explain why no sound is heard?
The sound waves produced are longitudinal waves.
The amplitude of the vibration is extremely large.
The frequency of the vibration is below 20 Hz20\text{ Hz}20 Hz.
The speed of the sound wave in air 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.