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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.
Periods can change the sound of voice. The hormonal changes related to a womanâs menstrual cycle also alter the sound of her voice. The cells from the larynx and vagina are believed to be similar and show similar hormone receptors. A 2011 study published in the journal Ethology found men can detect from a womanâs voice whether she is menstruating.