What frequency range is classified as audible sound?

The classification of audible sound encompasses the frequency range from 20 Hz to 20 kHz. This range represents the sounds that can typically be detected by the average human ear. Frequencies below 20 Hz are considered infrasonic, while frequencies above 20 kHz fall into the ultrasonic category, which is beyond human hearing capabilities. Within the audible range, sounds can include everything from the lowest bass notes to the highest treble sounds typically heard in music and spoken language. Understanding this range is crucial, especially in fields like sonography, where sound waves are utilized for imaging and other diagnostic purposes.