Final answer:
An audiogram uses the x-axis to measure the frequency of sounds in Hertz (Hz), which is the number of cycles per second that determine the pitch of a sound. Hertz is the standard unit of frequency, and audiograms typically test frequencies from 250 to 8000 Hz to assess hearing abilities.
Step-by-step explanation:
On an audiogram, the x-axis (horizontal axis) measures the frequency of sounds, which is expressed in Hertz (Hz). Frequency is the characteristic that determines the pitch of a sound and is defined as the number of complete cycles or waves that occur per second. Hertz is the SI unit for frequency, with one hertz being equal to one cycle per second. Audiograms typically display a range of frequencies, which can vary from about 250 Hz to 8000 Hz, to test human hearing abilities.
In the context of hearing tests, the frequency is crucial because it helps in identifying which specific frequencies a person can or cannot hear. The pattern of a person's hearing loss across different frequencies can assist audiologists in diagnosing and treating hearing issues. Moreover, the intensity level of sounds in an audiogram is measured in decibels (dB), which is relative to a normal hearing threshold.