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2.2 FACTORS AFFECTING PROPAGATION OF SOUND There are several important factors, which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. These are discussed separately below. 2.2.1 Geometric Spreading This refers to the spreading of sound energy as a result of the expansion of the wave fronts.
Impact of hyperacusis. In severe cases, reduced sound tolerance can confine the person to their home and affect their career and social life. Everyday activities, such as driving a car, using a lawn mower, vacuum cleaner or power tool, watching the television or listening to music, are problematic.