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17 Physics of Hearing

127 Introduction to the Physics of Hearing

Introduction to the Physics of Hearing

class=”introduction”
class=”section-summary” title=”Section Summary”class=”conceptual-questions” title=”Conceptual Questions”class=”problems-exercises” title=”Problems & Exercises”

This tree fell some time ago. When it fell, atoms in the air were disturbed. Physicists would call this disturbance sound whether someone was around to hear it or not. (credit: B.A. Bowen Photography)

Photograph of an old tree in a forest that had fallen some time ago.

If a tree falls in the forest and no one is there to hear it, does it make a sound? The answer to this old philosophical question depends on how you define sound. If sound only exists when someone is around to perceive it, then there was no sound. However, if we define sound in terms of physics; that is, a disturbance of the atoms in matter transmitted from its origin outward (in other words, a wave), then there was a sound, even if nobody was around to hear it.

Such a wave is the physical phenomenon we call sound. Its perception is hearing. Both the physical phenomenon and its perception are interesting and will be considered in this text. We shall explore both sound and hearing; they are related, but are not the same thing. We will also explore the many practical uses of sound waves, such as in medical imaging.

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Introduction to the Physics of Hearing by OpenStax is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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