Question

what are infrasonic and ultrasonic sound ​

Answer 1

Answer:

The sounds of frequency less than 20Hz are called infrasonics. The infrasonic sounds have below the lower limit of human hearing. The sound of frequency more than 20,000Hz are called ultrasonics. ultrasonic sounds have a frequency above the upper limit of human hearing.

Answer 2

Answer:

if the frequecy of the vibrations is less than 20HZ then the human ear cannot perceive them is called infrasonic

if the frequency of vibrations is above 20000HZ then the human ear cannot perceive them is called ultrasonic