Question

Which among the following frequencies is inaudible to humans?

• A. $20Hz$
• B. $5Hz$
• C. $50Hz$
• D. $30Hz$

Answer 1

The correct option is B $5Hz$

The audible range for humans is $20Hz$ to $20kHz$. From the above, $5Hz$ is not audible to humans. Sounds with frequencies below $20Hz$ are called infrasonic sounds and above $20kHz$ are called ultrasonic sounds.