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How do Amplitude and Frequency affect
the Loudness and Pitch of a 
Sound Wave?

Below is a picture of a sound wave that has
been changed into alternating current by a microphone
and displayed on a CRO.

Sound Wave displayed on a CRO

If the sound is made louder and with a higher pitch,
the shape of the wave changes as shown below.

Loud Sound Wave displayed on a CRO

The amplitude has got bigger because the sound is louder.
The frequency has increased
(there are more complete waves in the same time)
because the sound has a higher pitch.

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