Discussion 5.1.
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Added on 2019-10-18
Discussion 5.1.
Added on 2019-10-18
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Discussion 5.1Topic: Anyone who has ever worked in a noisy environment, such as on a factory floor, knows that there are often strict rules about how loud the sounds workers are exposed to can be, and for how long workers can be exposed. This is because long-term exposure to loud sounds can damage the sensitive hair cells in the inner ear. After they are damaged, hair cells are not replaced, resulting in permanent hearing loss.Although noise exposure in the workplace is a long-acknowledged danger, a much more recent concern is listening to personal music players (such as the iPod) through headphones. The popularity of these devices combined with the number ofhours many people—especially teenagers—use them, have led many hearing specialists to worry about the safety of the players. There is evidence to suggest that 5%–15% of headphone users listen to their music players at levels and lengths of time that are considered unsafe. Potentially, this could lead to an epidemic of hearing disabilities in the future.Given the potential long-term danger to hearing, some experts have recommended limiting by law the maximum volume on personal music players. Others, however, feel that this might be an oversimplification of the issue. This is because the risk to the listener is not just a function of the device’s volume, but other factors as well. For example, a 90 dB sound may be considered a relatively safe level when listening to music through headphones for a few hours, but exposure to 90 dB for 8hours in a day might cause hearing loss. Also, the type of headphones used can increase or decrease the loudness. Earbud style headphones tend to increase the loudness of the music compared to other styles of headphones when the volume control is kept at the same level. (Although earbud headphones can increase the maximum volume possible, studies have shown that, when using earbud-style headphones, listeners typically keep the volume setting lower than those who use headphones that do not enter the ear canal. This indicates that earbud headphones are probably of no greater risk to users.)
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