A) between 20 hertz and 1000 hertz
B) between 1000 hertz and 20000 hertz
C) less than 20 hertz
D) more than 20 kilohertz
Answer: D
Explanation: Ultrasonic waves are sound waves with a frequency above 20 kilohertz, higher than the limit of human hearing. They are used in medical scans.
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