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The source of sound is:
Sound is a:
For sound to propagate, a __ is required.
Sound cannot travel through:
The audible range for humans is:
Sound waves with frequencies below 20 Hz are called:
Sound waves with frequencies above 20,000 Hz are called:
The characteristic of sound that distinguishes between grave and shrill sounds is:
The characteristic of sound that distinguishes between loud and faint sounds is:
The characteristic of sound that distinguishes two sounds with the same loudness and pitch is:
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