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 difference between ultrasonic and infrasonic?

Hi,
 
The sounds having frequency more than 20,000 hertz (Hz) are called ultrasonic or ultrasound and the sounds having frequency less than 20 Hz are called infrasonic or infrasound. Both of these sounds cannot be heard by human beings. The audible range for of hearing by human beings is 20 Hz to 20000 Hz.
The speed of sound is same for all frequencies in a particular medium. So, speed of ultrasonic sound and infrasonic sound are same in a particular medium.

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View Full Answer

 The sound waves which are below the audible sound are called infrasonics(<20Hz) and The sound waves which are above the audible sound are called ultrasonics(>20KHz).

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 The main difference lies in the frequency. The range of frequency lower than our normal listening frequency i.e.20 Hz to 20000 Hz are infrasonic and frequency above 20000 are ultrasonic.

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 ULTRASONIC SOUND:The sound more then the audible range which is<20000hz

INFRASONIC SOUND:The sound which is>20hz

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