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NCERT CLASS IX - Science Textbook

Chapter 12 - Sound

What is the range of frequencies associated with

(a) Infrasound?
(b) Ultrasound?


(a) The sound having frequencies bellow 20 Hz are called infrasonic sound.
(b) The sound having frequencies above 20,000 Hz or 20 kHz are called ultrasonic sound.
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Sounds waves of frequencies below 20hz are infrasonic waves. Those above 20000 hz are called ultrasonic waves
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