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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- Fall '05
- Fluid Dynamics, Mach number, Linkin Park, Shock wave, Scramjet, Supersonic