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The frequency of ultrasonic wave is 

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The frequency of ultrasonic wave 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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(d) greater than 20 kHz 

Ultrasonic waves range above 20 kHz which is above the audible range of human ears.

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