SlidesApr27

SlidesApr27 - s P is the power, the rate of energy transfer...

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Sound is a density wave traveling through air Example: speaker vibrates and disturbs the air molecules - Mathematical function to describe a basic continuous traveling wave - Plotting math functions on the computer - Relationship between sounds and waveforms - Waveforms of the human voice - Spherical waves Circular waves (see animation on website) Intensity of Sound Waves s The intensity of a wave is the rate at which the energy flows through a unit area, A, oriented perpendicular to the direction of travel of the wave
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Unformatted text preview: s P is the power, the rate of energy transfer s Units are Watts/m 2 A P t A E I = = Spherical Waves s A spherical wave propagates radially outward from the oscillating sphere s The energy propagates equally in all directions s The intensity is 2 r 4 P I = Example problem s Suppose a bell emits sound in all directions (spherical waves). By what factor does the intensity of the sound change if you move from 5 meters away to 17 meters away from the bell?...
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SlidesApr27 - s P is the power, the rate of energy transfer...

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