Defects of hearing (A-level only) Flashcards – AQA A-level Physics (7408)

How can hearing loss from excessive noise vary with exposure?

It can be temporary or permanent, depending on the exposure.

Which frequencies are commonly most affected by noise-induced hearing loss?

Higher frequencies, often with a noticeable loss near $4\,\text{kHz}$.

How does noise-induced hearing loss affect the sound pressure level needed at affected frequencies?

A greater sound pressure level is generally needed for the sound to be heard or to produce a given perceived loudness.

What does an equal-loudness curve plot?

The sound pressure level required at each frequency for sounds to be perceived as equally loud.

How can hearing loss change an equal-loudness curve relative to normal hearing?

It can raise the curve in the affected frequency range, changing its shape rather than necessarily shifting it uniformly.

What is age-related hearing loss?

A deterioration in hearing with increasing age.

How does age-related hearing loss affect the sound pressure level needed to hear sounds or perceive them at a given loudness?

A greater level may be needed, especially for high-frequency sounds compared with low-frequency sounds.

How can age-related hearing loss affect speech perception?

It can make speech harder to distinguish, especially when high-frequency components help distinguish sounds.

What does an equal-loudness curve show?

The sound pressure level required at each frequency for sounds to be perceived as equally loud.

How can age-related hearing loss change an equal-loudness curve relative to normal hearing?

The curve can rise, especially at high frequencies, reflecting the greater sound pressure level needed there.