The audible range of normal human ear is ____?

The audible range of normal human ear is ____?

عام انسانی کان کی قابل سماعت حد ____ ہے؟
Explanation
The normal human ear can hear sounds between 20 Hz (low pitch) and 20,000 Hz (high pitch).
Sounds below 20 Hz are called infrasound, and above 20 kHz are ultrasound, both inaudible to humans.