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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.
The length and thickness of the vocal cords, however, are not the only factors that affect one's pitch. The pitch of someone's voice can also be affected by emotions, moods and inflection. Interestingly, our emotions can also affect the pitch of our voices. When people become frightened or excited, the muscles around the voice box (or larynx) unconsciously contract, putting strain on the vocal cords, making the pitch higher. Again, not all pitch change is done unconsciously.