4 types of ultrasonic waves

Definition of ultrasonic waves:

Ultrasonic waves are acoustic waves whose frequency is more than 20kHz .They travel with the speed of sound. Hence their wave length is smaller than 333200cms-1/ 20000Hz = 1.66 cm

 (ג = v/υ) . These waves possess a number of properties of sound waves and exhibit some new phenomena also.

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