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How does a vibrating guitar string create sound in the surrounding air?
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sound
Learn about the propagation of sound waves from a point source by observing the motion of a suspended vibrating spring.
When a guitar string is plucked, its vibrations disturb the surrounding air particles, causing them to move back and forth. These moving air particles subsequently disturb their neighbors, creating a chain reaction that propagates through the air as sound waves.1
These waves consist of alternating regions of compression and rarefaction—areas of high and low pressure, respectively—that travel through the medium. The amplitude of these waves, which corresponds to the magnitude of the air pressure fluctuation, determines the loudness of the sound; plucking the string harder displaces more air, resulting in a louder sound. The frequency of the vibration, measured in hertz, determines the pitch perceived by the listener.1