Question

Sound waves of frequencies lower than 20KHz is called ---------- sound.

Answer 1

Answer:

ultrasonics

Explanation:

Sound waves of frequencies lower than 20KHz is called ultrasonics sound.

thnks:)

Answer 2

Answer:

it is called infrasound ...

..

it very...very low pitched sound to hear .

and above 20 KHz is called ultra sound...

hope it's helps u...