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Chapter 5

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Department
Commerce
Course
COMMERCE 4BL3
Professor
ghj
Semester
Summer

Description
Chapter 5 Physical Agentsphysical agents sources of energy that may cause injury or disease ex noise vibration radiationextremes in temppressureambient allencompassing condition associated w a given envt being usually a composite of inputs from sources all around us early warning change a deterioration of hearing in the upper frequencythe earliert detectable sign of noiseinduced hearing loss8 of ppl in 2003 in BC showed signs of hearing lossthreshold of hearing the envelope or range of sound that the human ear can perceive or hear o sound is measured in dB 3dB diff2x as loud 10dB diff10x as loud 20dB diff100x as loudHuman hearing response is conditional on 3 characteristics frequency durationloudnessNoise affects human in 3 ways1 Physiological damage that affects hearing a conductive restricts the transmission of sound to the inner ear ie wax buildup infection trauma b sensorineural nerve deafnessaffects the cochleais irreversible tinnitus ringing in the ears2 More general physiological effect a noise ca
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