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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.
at a glance there are many factors both internal and external that can influence the quantity and quality of the sleep we obtain sleep scientists understand how various factors affect sleep and why they have the effects they doight s effect light is one of the most important external factors that can affect sleep it does so both directly by making it difficult for people to fall asleep and indirectly by influencing the timing of our internal clock and thereby affecting our preferred time to sleep