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Waves

Sound - Loudness and Pitch.

The loudness of sound depends on the amplitude of the wave.
The bigger the amplitude, the louder the sound.

The pitch of sound (how high the note is)
depends on the frequency of the wave.
The higher the frequency, the higher the pitch.

Sound is a longitudinal wave
and so it is difficult to show the amplitude and frequency on a diagram.
A microphone can be used
to change the sound wave into an alternating current
which can be displayed as a transverse wave on a CRO.
This makes it easier to show the effect of amplitude and frequency
on loudness and pitch (see next page).

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