Chapter 17 - Waves II - Sound Waves.pptx - Chapter 17 – Waves II(Sound Waves Physics 142 Daniel Allen Waves II – Sound Waves • Goal of

Chapter 17 - Waves II - Sound Waves.pptx - Chapter 17 –...

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Chapter 17 – Waves II (Sound Waves) Physics 142 Daniel Allen
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Waves II – Sound Waves Goal of physics/engineering Use sound waves Applications How do we use sound? Who uses sound?
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Waves II – Sound Waves Goal of physics/engineering Use sound waves Applications How do we use sound? Who uses sound? Audiologists, physiologists – hearing and speech Acoustic engineers – acoustics, highway noise, music Aviation engineers – jet noise, shock waves Paleontologist – what did a dinosaur sound like? Petroleum engineer – mineral exploration Doctor – ultrasound Navy captain – sonar
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Longitudinal Waves
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3D Sound Propagation Near source spherical Far from source planar
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Speed of Sound Speed of any wave depends on… Inertial property of medium (K storage) Elastic ‘springy’ property of medium (P storage) For string waves
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Speed of Sound Sound waves in 3D Inertial part: μ ρ = volume density Elastic part: air compressing and decompressing Pressure changes and volume changes Define bulk modulus
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Speed of Sound Speed of any wave depends on… Inertial property of medium (K storage) Elastic ‘springy’ property of medium (P storage) For sound waves
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? = ? ? / ?
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Traveling Sound Waves What are the displacements and pressure changes associated with a wave passing through a long, air-filled tube? Slinky motion!
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Traveling Sound Waves What are the displacements and pressure changes associated with a wave passing through a long, air-filled tube?
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  • Fall '18
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