Question

what is infrasonic sound​

Answer 1

Explanation:

Pertaining to VIBRATIONs and SOUND WAVEs whose FREQUENCY is too low to be heard as sound by the human ear, i.e. below about 20 Hz. The term is also used loosely to describe any low frequency sound.

Answer 2

Answer:

Infrasonic sound

Explanation:

A sound having frequency less than 20 Hz is not audible to the human being threrefore the sound having frequency less than 20 Hz is called Infrasonic sound