Chapter17 - PHYS276, S09 Chapter 17 1 Chapter 17: Sound...

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Unformatted text preview: PHYS276, S09 Chapter 17 1 Chapter 17: Sound Waves Demos: http://www.physics.umd.edu/deptinfo/facilities/lecdem/lecdem.htm G3-28: hanging slinky H1-01: bell in vacuum H1-02 speaker and candle H2-41: Doppler Ball Thanks to Prof LaPorta and Peer Instruction by Eric Mazur Sound PHYS276, S09 Chapter 17 2 What is sound? What is the relation between loudness and power? Doppler effect and sonic boom Chapter 16 Sound Waves Sound is a longitudinal wave (displace in same direction as propagation direction) It also may be described as a pressure wave. Sound PHYS276, S09 Chapter 17 4 H1-01 Bell Jar H1-02: speaker and candle Longitudinal pressure waves in a media (air, water, etc) Source: some kind of mechanical vibration that pushes the media (often air): vibrations of the cone of a speaker, your vocal chords, a hammer that hits a bell, your lungs blowing into an instrument, etc pressure wave P= P max sin( kx t ) P max is the change from the equilibrium pressure s = s max cos( kx t ) s max is the maximum displacement of a particle in the medium from its equilibrium position (usually equal to the displacement at the source)...
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Chapter17 - PHYS276, S09 Chapter 17 1 Chapter 17: Sound...

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