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Unformatted text preview: strings are plucked simultaneously at their centers. By what percentage was the string tension changed? Problem 3 A manufacturing rm has hired your company, Acoustical Consulting, to help with a prob-lem. Their employees are complaining about the annoying hum from a piece of machinery. Using a frequency meter, you quickly determine that the machine emits a rather loud sound at 1200 Hz . After investigating , you tell the owner that you cannot solve the problem entirely, but you can at least improve the situation by eliminating reections of this sound from the walls. You propose to do this by installing mesh screens in front of the walls A portion of the sound will reect from the mesh; the rest will pass through the mesh and reect from the wall. How far should the mesh be placed in front of the wall for this scheme to work? 1 - 1...
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- Winter '08