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 re²ections 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 re²ect from the mesh; the rest will pass through the mesh and re²ect 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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This note was uploaded on 04/26/2009 for the course PHYS 153 taught by Professor Measday during the Winter '08 term at UBC.
- Winter '08