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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.
There are three factors that significantly affect the ability to sing higher or lower: 1  The energy factor â energy has several connotations. 2  The space factor â space refers to the size of the inside of the mouth and the position of the palate and larynx. 3  The depth factor â depth has two connotations.