Final answer:
Air rushing through the vocal folds contributes to pushing them together through the Bernoulli effect, which is a fluid dynamic principle that results in a decrease in pressure as the speed of the fluid increases.
Step-by-step explanation:
Air rushing through the vocal folds contributes to pushing them together through the Bernoulli effect. This is a principle where the increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. When air travels up and past the vocal folds, it causes them to vibrate and contributes to the voices we produce. The vibration of the vocal cords along with puffs of air creates sound. As points of comparison, the Venturi effect is similar in that it is also related to fluid dynamics while the Doppler effect relates to a change in frequency or wave intensity observed when there is relative motion between an observer and a wave source. However, the Doppler effect does not explain the dynamic observed in vocal fold vibration. Lastly, the Photoelectric effect is related to electromagnetic waves and is not applicable to this case.