Question

Sound waves of frequency less than 20 Hz are _____ waves.

Answer 1

1. Frequency of a sound wave is defined as the number of sound waves that pass through a point in one second.
2. Sound can be divided into different categories based on the range of its frequency.
3. Sound waves of frequency below 20 Hz are termed infrasonic.
4. Sound waves of frequency above 2000 Hz are termed ultrasonic.
5. Sound waves of frequency 20 Hz - 2000 Hz are audible to the human ear.

Hence, sound waves of frequency less than 20 Hz are infrasonic waves.