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Chapter 14

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Chapter 14Sound1Sound Waves Sound is longitudinal pressure (compression) waves Range of hearing: 20 Hz to 20,000 HzFREQUENCY DEMO2Speed of SoundLiquids and Gases: B is bulkmodulus, ! is mass/volumeSolids: Y is Young s modulus331 m/s is v at 0 C;T is the absolute !v=Y!vair=(331ms)T273K3Example Brown hits a steel railroad rail with a Brown, standing one mile down the track, hearsthe bang through the cool 32 F air while her twin sister Boopsie is lying next to her and hears the bang through the steel by placing her ear on the : Ysteel= Pa, !steel=7850 kg/m3What is the time difference between the moments when Betsy and Boopsie hear the bang? s4Intensity of Sound WavesSI units are W/m2PowerAreaIntensity is proportional to squareof amplitude (pressure modulation)I=!EA!t=PA5Intensity Range for Human HearingThreshold of Hearing 10-12 W/m2 "P ~ 10-10 atm !

Chapter 14 Sound 1 Sound Waves •Sound is longitudinal pressure (compression) waves • Range of hearing: 20 Hz to 20,000 Hz FREQUENCY DEMO 2 Speed of Sound Liquids and Gases: B is bulk

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