Question

What are infrasonic waves

Answer 1

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.

Answer 2

Answer:

if a body is vibrating with a frequency of less than 20 per second its vibrations cannot be perceived by the human ear these vibrations are called infrasonic vibrations