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# fef06 - Name ME 513Q Final Exam Fall 2006 Note To help you...

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Name: ________________ ME 513Q Final Exam – Fall 2006 --- 12/13/2006 Note: To help you complete this exam, you may refer to your class notes, your homework, solutions provided to you and other material distributed as part of the course, and the text (Kinsler, Frey, Coppens and Sanders) or to any other acoustics text Problem 1: ____________/30 Problem 2: ____________/20 Problem 3: ____________/20 Problem 4: ____________/20 Problem 5: ____________/20 Problem 6: ____________/20

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Problem 1. (i) What is sound? (ii) Does the sound speed depend on ambient atmospheric pressure (given that the temperature is constant)? (iii) What is the acoustical “inverse square law”? (iv) Why was the reference intensity chosen to be 1 × 10 -12 W/m 2 ? (v) At the interface between two ideal fluids, which component of the acoustic particle velocity is not continuous across the interface? Why? (vi) When a plane wave in air hits the surface of a very deep layer of water at normal incidenece, the transmitted pressure magnitude is __________________ than that of the incident wave while the transmitted intensity is ___________________ than that of the incident wave.
(vii) When considering sound transmission through a limp barrier, doubling either the _____________________ or the _______________________ causes the transmission loss of the barrier to increase by 6 dB. (viii) When can a reflecting surface be modeled as being “locally reacting”? (ix) An unbaffled loudspeaker can be modeled as a _________________________ . (x) When a point monopole is placed at the junction of three rigid, perpendicular surfaces, _________________ image sources are required to satisfy the hard wall boundary conditions. (xi)

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## This note was uploaded on 12/26/2011 for the course ME 513 taught by Professor ### during the Fall '07 term at Purdue.

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fef06 - Name ME 513Q Final Exam Fall 2006 Note To help you...

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