GCSE PHYSICS - What is the Loudness of a Sound Wave? - What is the Pitch of a Sound Wave?

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What is the Loudness and Pitch of a Sound Wave?

What is the Loudness of a Sound Wave?

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

What is the Pitch of a Sound Wave?

The pitch of a 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 change the sound wave into
an alternating current that can be displayed
as a transverse wave on a CRO. This makes it
easier to show the affect of amplitude and frequency
on loudness and pitch (see the next page).

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