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Sound waves with frequencies higher than 20,000 Hz are referred to as subsonic waves.

User: The pitch of a sound is most closely related to the

Afrequency of vibrations.
Bdistance from the sound source.
Cmedium through which the sound travels.
Dintensity of the sound.

Verified Answer :

AL2006


Sounds at frequencies higher than 20,000 Hz
are called "ultrasound" waves.  "Subsonic"
are those at frequencies lower than 20 Hz.

The pitch of a sound is intimately related to
the frequency of the sound vibrations.

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