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:WavesIIChapter 17 Homework1, 16, 17, 26, 28, 35, 40, 41, 47, 50, 53, 56, 58, 62, 69Sound IntensityP PowerA AreaAPI=Intensity SoundThreshold of hearing:I= 11012W/m2Normal conversation: 1106W/m2Threshold of pain:10 W/m221221)(rrII=Isotropic point source:)(log)dB10(Decibels10II=10)(1210121010-==IIII0 dB60 dB130 dB24rPI=ExamplesSample Problem 17-4. Spark along a lineL= 10 m, Ps= 1.6104WFind (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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phy2048 lecture33 - 17-1 What Is Physics? 17-2 Sound...

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