Question

Sound of frequency below $20Hz$ is called

• A. audio sounds
• B. infrasonic
• C. ultrasonic
• D. supersonics

Answer 1

The correct option is B infrasonic

Sound waves are categorized on the basis of their frequency range.

Sound of frequency below $20Hz$ is called as infrasonic. Sound of frequency above $20kHz$ is called as ultrasonic whereas sound of frequency in between $20Hz$ to $20kHz$ is called as audio sound.