Hearing ：練習問題

In the human ear, one specific part of the inner ear is distinctively shaped like a snail shell. Which part is this?

Prolonged exposure to high sound levels can lead to permanent hearing loss. Why is this type of hearing loss usually irreversible?

A sound is produced by a vibrating object. If the loudness of the sound is increased, which property of the vibrating object must have increased?

When sound waves reach the ear, they are directed toward a thin, tightly stretched membrane. What is the name of this membrane that is the first to vibrate in response to sound?

The auditory nerve plays a vital role in hearing. According to the relationship between sense organs and the brain, which part of the brain is the primary destination for the electrical signals sent by the auditory nerve?

When studying noise pollution, why is it necessary to use a decibel meter rather than relying only on human hearing?

In the human ear, sound vibrations are eventually converted into electrical nerve impulses. Identify the specific structure within the inner ear that contains the specialized sensory cells responsible for this conversion.

The human ear can detect frequencies up to approximately \(20,000\, \text{Hz}\). However, many animals, such as dolphins, can hear ultrasonic sounds far exceeding this limit. In terms of the ear's structure, what essential adaptation must the specialized sensory organ possess to allow the detection of these higher frequencies?

Sound is a form of energy that we perceive through our ears. It has specific properties such as frequency and loudness.

a) All sounds are produced by the vibrations of objects. If a guitar string vibrates \(200\) times in one second, state the frequency of the sound produced and include the correct unit symbol. (1 point)

b) State the name of the unit used to measure the loudness of sound. (1 point)

c) Identify the part of the inner ear that contains specialized sensory cells for detecting these vibrations. (1 point)

A technician is measuring noise levels at different sites. The results show a construction site at \(110\,\text{dB}\) and a quiet library at \(40\,\text{dB}\).

a) State the unit represented by 'dB' and the physical property of sound it measures. (1 point)

b) Compare the potential health risks for a worker exposed to the construction site noise for 8 hours daily versus the library environment. Mention one specific structural damage that could occur in the inner ear. (2 points)

c) Suggest two distinct methods to protect the hearing of the construction worker. One should be a personal protective measure and one should be an environmental control. (2 points)