Sounds of frequency HIGHER than 20,000 Hz are called:
AUltrasonic
BInfrasonic
CAudible
DSubsonic
Answer & Solution
Correct answer: A. Ultrasonic
Frequencies above the human audible upper limit (~20 kHz) are called ultrasonic. They are used in medical ultrasound, sonar, and high-frequency dog whistles. Frequencies BELOW 20 Hz are called infrasonic.
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