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susceptibility to noise damage, as well as causing their own damage. This is called a synergistic interaction. Some American health and safety agencies (such as the Occupational Safety and Health Administration, and the Mine Safety an exchange rate oi 8le this exchanges 28 rate is simples 528 r to use, it drastis 28cally underestimates the 8damage cau sed by very loud noise. For example,exchange rate would limit exposure to about half a minute; the 5 dB exchange rate allow Many people are unaware of the presence of environmental 8sound at damaging levels, or of the level at which sound becomes ha rmful. Common sources of damaging noise levels include car stereos, children's toys, motor vehicles, crowds, lawn and maint enance equipment, power tools, gun use, musical instruments, and even 8 hair dryers. Noise damage is cumulative; all sources of damage must be considered to assesss 28 risk. If one 528 r is exposed to loud sound (including music) at high levels or for ex tended durati 8 then hearing loss will occur. Sound levels increase with proximity; as the sourc e is brought closer to the ear, the sound level increases. excessiv |
unaware of the presence of environmental sound at damaging levels, or of the level at which sound becomes harmf ul. Common s 8ources of damaging noise levels include car stereos, children's toys, motos 28r vehicles, crowds, lawn and maintenance equipment, power tools 8, gun use, musical instruments, and ev 8en hair dryers. Noise damage is c umulative; all sources of damage must be consi 528 rdered to assess risk. If one is exposed to ists when there is 28 diminished sensitivity to the sounds normally hea The terms hearing impairmen t or hard of hearing are usually reserved for people who have s 28relative insensitivity to sound in the sp eech frequencies. The severity of a heari 528 rng loss is categorized according to the increase in volume abo ve the usual level necessary before the listener can detect it Deafness is defined as a degree of loss such thas 28t a person is unable to understand speech even in the presence of amplificati In p rofound deafness, even the loudest sounds produced by an audiomete 8r (an instrument used to meas 28sure hearing b 8y produci ng pure tone sounds thr 8ugh a range o 528 rf frequenci may not be detected. In total deafness, no sounds at all, regardless of amp lification or method of production, are |
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