504_Physics ProblemsTechnical Physics

504_Physics ProblemsTechnical Physics - 506 P17.25 Sound...

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506 Sound Waves P17.25 (a) I 1 12 10 12 80 0 10 1 00 10 10 1 00 10 10 1 −− .. . Wm 22 ej bg β or I 1 4 100 10 . W m 2 I 2 12 10 12 75 0 10 1 00 10 10 1 00 10 10 2 . or I 2 4.5 5 1 00 10 3 16 10 When both sounds are present, the total intensity is II I = + = × 12 45 4 1 00 10 3 16 10 1 32 10 . 2 . (b) The decibel level for the combined sounds is = × × F H G I K J = 10 132 10 10 1 32 10 81 2 4 12 8 log . . log . . ±Wm dB 2 2 . *P17.26 (a) We have λ = v f and f is the same for all three waves. Since the speed is smallest in air, is smallest in air. It is larger by 1493 331 451 ms times = . in water and by 5950 331 18 0 = t im e s in i ron. (b) From Iv s = 1 2 ρω max ; s I v max = 2 0 0 2 , s max is smallest in iron, larger in water by ρ iron iron water water times v v = = 7 860 5 950 1 000 1 493 560 . , and larger in air by 7 860 5 950 129 331 331 = . times . (c) From I P v = max 2 2 ; PI v max = 2 , P max is smallest in air, larger in water by 1 000 1 493 59 1 = . . times , and larger in iron by 7 860 5 950 331 = . times . (d) π ω == = = v f v 2 331 2 2000 0331 s m . in air
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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