Sound waves too high in frequency to be heard by the human ear, generally above 20 kHz, are known as:
A. High-frequency sound waves
B. Microwave waves
C. Ultrasonic waves
D. Short-frequency sound waves
E. None of the above
Sound waves too high in frequency to be heard by the human ear, generally above 20 kHz, are known as:
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Sound waves too high in frequency to be heard by the human ear, generally above 20 kHz, are known as:
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