phy2048 lecture33

phy2048 lecture33 - 17-1 What Is Physics 17-2 Sound...

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Unformatted text preview: 17-1 What Is Physics? 17-2 Sound Waves17-3 The Speed of Sound17-4 Traveling Sound Waves17-5 Interference17-6 Intensity and Sound Level17-7 Source of Musical Sound17-8 Beats17-9 The Doppler Effect17-10 Supersonic Speeds, Shock WavesChapter 17:Waves—IIChapter 17 Homework1, 16, 17, 26, 28, 35, 40, 41, 47, 50, 53, 56, 58, 62, 69Sound IntensityP– PowerA– AreaAPI=Intensity SoundThreshold of hearing:I= 1×10–12W/m2Normal conversation: 1×10–6W/m2Threshold of pain:10 W/m221221)(rrII=Isotropic point source:)(log)dB10(Decibels10II=β10)(1210121010βββ-==IIII0 dB60 dB130 dB24rPIπ=ExamplesSample Problem 17-4. Spark along a lineL= 10 m, Ps= 1.6×104WFind (a) Iat r= 12 m, and (b) Pdintercepted by a detector of Ad= 2.0 cm2at r= 12 m.(21 W/m2, 4.2 mW)Sample Problem 17-5. Special ear plugDecrease the sound level by 20 dBFind the ratio of If/ Ii. (0.010)Doppler EffectWhen the motion of Detector or Source is toward the other, the sign on its speed must give an upward shift in frequency.sign on its speed must give an upward shift in frequency....
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This note was uploaded on 04/17/2008 for the course PHY 2048 taught by Professor Chen during the Fall '08 term at UNF.

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phy2048 lecture33 - 17-1 What Is Physics 17-2 Sound...

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