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Unformatted text preview: Physics 19 Fall, 2004 Hour Exam 1 2 3 4 5 Total Name: Recitation Time Recitation Leader Nov. 2, 2004 This exam is closed notes and closed book. You must show enough work on all problems to convince the grader you understand how to solve the problem. You may use a calculator. An equation sheet is on the last page. There are three problems; each counts 20 points. The points for each problem are divided approximately equally among the parts (a), (b), etc. Problem 1. Two identical loudspeakers are con- nected to the same amplifier so that they are in phase. The speed of sound in air is 345 m/s. 3.0 m 4.0 m 5.0 m 4.0 m (a) (b) d P (a) What are the two lowest frequencies f 1 and f 2 at which the speakers in panel (a) can be driven to produce maximum intensity at the point P ? (b) The wires to one speaker are now reversed so that the loudspeakers are exactly out of phase, and the distance between the speakers is increased to d as shown in panel (b). (The two speakers and the point P again form a right triangle.) Find the smallest value of d > 3 . 0 m such that inten-...
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