Audible sound is in the frequency range of:

The correct range for audible sound is generally accepted to be from 20 Hz to 20,000 Hz (20 kHz). This range represents the frequencies that the average human ear can detect. Sounds below 20 Hz are classified as infrasound, while sounds above 20,000 Hz are classified as ultrasound.

Understanding this range is important in the context of ultrasound and sonography since most medical ultrasound applications utilize frequencies above the audible range (typically 1 MHz to 10 MHz) for imaging. This knowledge helps in differentiating between what can be heard and what falls within the spectrum used in diagnostic imaging. Additionally, awareness of the upper and lower limits of human hearing is crucial for those working in sound-related fields, including healthcare, where both audible and inaudible frequencies play significant roles.