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Question


Ultrasonic sound have frequency ___.


Options:
A .   below 20 Hz
B .   between 20-2,000 Hz
C .   between 2,000-20,000 Hz
D .   above 20,000 Hz
Answer: Option D
:
D
Ultrasonic refers to sound having frequency higher than the upper audible limit of human hearing. It has frequency above 20,000 Hz.

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