ExamI2000 - 29:029 Physics III Exam I September 22, 2000...

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29:029 Physics III Exam I September 22, 2000 Closed book exam. Please show all work to get full credit. Point values for each problem are indicated. Please ask questions if you need clarification. If you don’t show your work, or make written comments, then there is no way for me to give partial credit. 1) (12 points) Consider waves on a string that has tension T, mass density μ , and length L. One end of the string is fixed, but the other end is free to move vertically. a) What is the frequency of the lowest frequency standing wave on the string? b) What is the total energy in the standing wave in a) if the amplitude of the oscillation is D? 2) (12 points) Sound source A is located at x =0, y =0, and sound source B is placed at x =0, y =2.4m. The two sources radiate coherently in phase. An observer at x =40m, y =0 notes that as she walks along in either the positive or negative y direction away from y =0, the sound intensity diminishes. What is the lowest and the next higher frequency of the sources that can account for that observation?
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ExamI2000 - 29:029 Physics III Exam I September 22, 2000...

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