Sound is caued by mechanical vibrations transmitted through a solid, liquid and gas and travel as a wave.
Sound refers to those vibrations with frequencies detectable by the human ear. This is in the range 20 – 20,000 Hertz (Hz).
- __Create a sound that is outside the range of human hearing
The animation of a vibrating diaphragm of a radio speaker below shows the generation and propagation of a sound wave.