Ans. AUDIBLE FREQUENCY RANGE
The range of the frequency which a human ear can hear is called audible frequency range.
A normal human ear can hear a sound only if its frequency lies between 20 Hz to 20,000 Hz. In other words, a human ear neither hears a sound of frequency less than 20 Hz nor a sound of frequency more than 20,000 Hz. Different people have different range of audibility. It also decreases with age. young children can hear sounds of 20,000 Hz but old people cannot hear sounds even above 15,000 Hz.