PS262 Chapter Notes - Chapter 11: Stapes, Lever Action, Tectorial Membrane

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7 Apr 2013
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Ps262 chapter 11 sound, the auditory system and pitch perception. Physical definition: sound is pressure changes in the air or other medium: ex// the sound levels was 10 decibels. Perceptual definition: sound is the experience we have when we hear: ex// the sound of the trumpet pierced the air. A sound stimulus occurs when the movements or vibrations of an object cause pressure changes in the air, water or any elastic medium that surrounds the object. When the speaker diaphragm moves back, air molecules spread out to fill in the increased space, a process called rarefaction: the decreased density of air molecules caused by rarefaction causes a slight decrease in air pressure. When air pressure changes, which travels through the air at 340 meters per second it is called a sound wave. Although air pressure changes move outward from the speaker, the air molecules at each location move back and forth but stay in about the same place.

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