Question

differentiate between infrasoinic and ultrasonic sounds

Answer 1

the sound of frequency 20 -20000HZ is known as infrasonic sound.
the sound of frequency more than 20-20000 HZ is called ultrasonic sound.
infrasonic sound is pleasant to hear whereas ultrasonic sound is unpleasant to hear.

Answer 2

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