The Frequency of Ultrasound Waves is

(A) less than 20 Hz
(B) between 20 Hz and 2 kHz
(C) between 2 kHz and 20 kHz
(D) greater than 20 kHz

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Correct Answer : greater than 20 kHz
Question Asked : UPSC NDA/NA EXAM 2018
Explanation : Ultrasonic waves range above 20 kHz. Which is way above the audible range of human ears.
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