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What is called the sound wave above than frequencies of 30000 Hz? 

(a) Ultrasound

(b) Infrasound

(c) Hypersonic sound

(d) No option is correct

1 Answer

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(a) Ultrasound

30000 Hz. Sound waves with frequency more than 20 kHz are called ultrasonic waves. Therefore sound waves of frequency 30000 Hz are called as ultrasonic sound.

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