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Sound/How we hear

Sound is made when something vibrates.

The frequency of the sound is how many vibrations pers second. It is measured in herts. Higheer pitched sounds have a higher pitched frequency.

Amplitude of a vibration is the distance between the midpoint and the furtherst point. Louder sounds have higher amplitudes. 1 kilohertz=1000 hertz.

The range of human hearing is from about 20Hz- 20,000Hz.

Sound causes air molecules to vibrate. Sound travels along the ear canal and makes the eardrum vibrate. This makes the bones in the middle ear vibrate. This sends a message to the brain along a nerve.

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