Q12 of 805 Page 156

An object moving at a speed greater than that of sound is said to be moving at

An object moving at a speed greater than that of sound (343m/s) is said to be moving at supersonic sound.


Infrasonic sounds are the sound waves below the audible frequencies < 20Hz.


Ultrasonic sounds are the sound waves above the audible frequencies > 20,000Hz.

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