MHR 711 Lecture Notes - Lecture 5: Conductive Hearing Loss, Sound Level Meter, Noise Unit
14 Dec 2016
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Document Summary
Physical agents are sources of energy that may cause injury or disease if they are not controlled or managed properly. Examples include noise, vibration, radiation, and extremes in temperature and pressure. Each of these agents may be ambient or acute (i. e. , resulting from a single exposure). Noise is defined as any unwanted sound and is often referred to as the most common workplace hazard. Technically, it refers to the auditory sensation evoked by the oscillations in pressure in a medium with elasticity and viscosity, such as air. Sound and noise differ by definition in that that noise is unwanted sound. One canadian study reported that approximately 95% of construction workers were exposed to high levels of noise on a daily basis. Even in office settings and computer labs, annoyance, stress, and interfering with communicating are some of the concerns associated with noise.
