Question

define infrasonic and ultrasonic sound​

Answer 1

#INFRASONIC

The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20 Hz. Sources of infrasound in nature include volcanoes, avalanches, earthquakes and meteorites.

#ULTRASONIC

The term "ultrasonic" applied to sound refers to sound waves above the frequencies of 20 KHz or 20000 Hz.

Answer 2

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➡ Ultrasonic sound: The sounds of frequency more than 20,000 Hz are called ultrasonic sounds.

➡ Infrasonic sounds: The sounds of frequency less than 20 Hz are called infrasonic sounds.