f15_ps05_spring04 - Unified Engineering Fluids Problems...

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Unformatted text preview: Unified Engineering Fluids Problems F15 Spring 2004 F15. Our analysis for determining the speed of sound assumed that the sound wave had infinitesimal strength. But for the 120 dB sound waves produced by Linkin Park near the stage, this assumption may be suspect. a) One suitable definition of sound dB level is: � dB = 20 log10 ∆p 20 × 10−6 Pa � where ∆p is a pressure variation caused by an average passing sound wave. Treating this sound wave as a shock wave, determine its propagation Mach number into still air. Hint: Put the propagating-shock situation into the shock’s frame of reference. b) Determine the temperature fluctuations associated with the passing waves. Would you say Linkin Park makes strong or wimpy shock waves? ...
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