Q65 of 199 Page 208

What are infrasonic waves? Name two animals which produce infrasonic waves.

Infrasonic are vibration of frequency less than 20 Hz. Whales and elephants produced infrasonic.


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What is ultrasound? What is the difference between ordinary sound and ultrasound?

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Write any three applications (or use) of ultrasound.

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What are infrasonic waves? Name two animals which can produce ultrasonic waves.

 65

The audible range of frequencies of an average human ear is from 20 Hz to 20 kHz. Calculate the corresponding wavelengths. (Speed of sound in air is 344 m s-1).