Sound

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The loudness of a

sound is linked to the size of the vibrations. Large vibrations produce louder

sounds. Quiet sounds are caused by small vibrations

The number of

vibrations made in one second is called the frequency. It is measured in hertz.

The pitch of a sound is linked to the frequency of the vibrations. High pitch

sounds have high frequency. Low pitch sounds have low frequency.

We

measure loudness using the decibel scale

Speed equation

·

Speed = Distance

Time

·

Distance = Speed x time

Speed is measured in meters per

second – m/s

Loud sound

Quiet sound

Low pitch

High pitch

Loud high pitch

Quiet high pitch

Loud low pitch

Quiet low pitch

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