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?
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
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
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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Traveling Sound Waves What are the displacements and pressure changes associated with a wave passing through a long, air-filled tube? Slinky motion!
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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