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