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What are infrasonic and ultrasonic waves?

frequency lower than 20 hz is infra sound and more than 20,000 hz is called ultra sonic sound 

ultra sonic sounds have many advantages like used for echo cardigraphy, sonography etc

infra sound are used by animals for communcating

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Frequency of Sound lower than 20 Hz is called as infrasonic sound ...Frequency of sound more than 20,000 Hz or 20 kHz is is called as ultrasonic sound .

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-> Infrasonic Waves - Waves having frequency less than 20 Hz. They are not audible by humans, but animals like                                                     elephant can hear this sound.

-> Ultrasonic Waves - Waves having frequency more than 20,000 Hz. They are not audible by humans, but animals like                                           dogs, bats, dolphins can hear this sound.

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