Final answer:
The y-axis of an audiogram represents the loudness or intensity level of sounds, measured in decibels (dB), with normal hearing level set at 0 dB.
Step-by-step explanation:
Decibels (dB) measure the loudness or intensity level of sounds and are represented along the y-axis of an audiogram. An audiogram is a graphical representation of a person's hearing ability across a range of frequencies, typically from 250 to 8000 Hz. The y-axis indicates the intensity level of sounds in decibels relative to a standard threshold of hearing, with normal hearing registering as 0 dB at all frequencies. Sounds that have a higher amplitude, or height of the sound wave from peak to trough, are louder and therefore higher on the decibel scale. Everyday sounds such as normal conversation occur around 60 dB, but exposure to sounds above 80 dB over extended periods can potentially cause hearing damage.