Question

Which has frequency below the audible range? (a) Ultrasonic (b) Supersonic (c) Infrasonic (d) All of these

Answer 1

option (c)

Step-by-step explanation:

The frequency ranges for infrasonic is below 20 Hz.

The frequency ranges for audible is 20 Hz to 20000 Hz.

The frequency ranges for ultrasonic is above 20000 Hz.

So, infrasonic have frequency below the audible range. We cannot hear this frequency.