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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Occupational Hearing Loss Frequent exposure to loud noise of a particular pitch can cause loss of hair cells in the part of the cochlea that responds to that pitch. People who work with or around noisy machinery are at risk for such frequency-specific hearing loss. Taking precautions such as using ear plugs to reduce sound exposure is important. Noise-induced hearing loss can be prevented, but once it occurs it is irreversible because dead or damaged hair cells are not replaced.

FIGURE 33.11 shows the threshold decibel levels at which sounds of different frequencies can be detected by an average 25-year-old carpenter, a 50-year-old carpenter, and a 50-year-old who has not been exposed to on-the-job noise. Sound frequencies are given in hertz (cycles per second). The more cycles per second, the higher the pitch.

Chapter 33, Problem 2DAA, Occupational Hearing Loss Frequent exposure to loud noise of a particular pitch can cause loss of

FIGURE 33.11 Effects of age and occupational noise exposure on hearing. The graph shows the threshold hearing capacities (in decibels) for sounds of different frequencies (given in hertz) in a 25-year-old carpenter (blue), a 50-year-old carpenter (red), and a 50-year-old who did not have any on-the-job noise exposure (brown).

How loud did a 1,000-hertz sound have to be for the 50-year-old carpenter to detect it?

Summary Introduction

To determine: The loudness of a 1000 hertz sound in such a way that it can be heard by the 50-year old carpenter.

Introduction: Hearing refers to the perception of sound. The loudness of sound is measured in decibels. The frequency of sound is measured as number of wave cycles per second or hertz. This determines the pitch of the sound which is directly proportional to hertz. The range of frequency that can be heard by human ears is 20-20,000 hertz. Continuous exposure to loud noises can damage the hair cells in the inner ear that may result in a temporary or a permanent hearing loss.

Explanation

Refer to Fig. 33.11, “Effects of age and occupational noise exposure on hearing” in the textbook. The graphical representation shows the threshold hearing capacities for sounds of different frequencies in an average 25-year old carpenter (denoted as blue), a 50-year old carpenter (denoted as r...

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