# HW5 - Oregon State University Physics 202 HW5 Winter Term...

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Oregon State University Physics 202 , Winter 2010 HW5 (due Feb. 8 at 5:00 p.m.) Page 1 Oregon State University Physics 202 Winter Term, 2010 HW5 This HW assignment, due February 8, covers topics from lecture and from Chapter 16 (and o also possibly Chap- ters 13-15) of the text. Of these problems, two will be scored (for a possible 10 points). Donʼt forget the extra credit point that is available, too—see the course web site, under the links for recitation/Homework (HW). Follow the recommended format for problem solutions, use SI units unless directed otherwise, and assume three signi± - cant digits in all numerical answers . 1. Two loudspeakers on a concert stage are vibrating in phase. You are sitting at a distance of 5.50 m from the left speaker and 3.86 m from the right speaker. The speakers are playing music that varies in frequency (i.e. many different frequencies are included in the sound that arrives at your ears), but certain frequencies will consistently sound louder to you. If the speed of sound is 343 m/s, what are the two lowest such frequencies? 2. A row of seats is parallel to a stage at a distance of 8.7 m from the stage. At the center and front of the stage is a loudspeaker with a circular aperture of diameter 7.5 cm. The speaker is playing a tone with a frequency of 10,000 Hz, and the speed of sound is 343 m/s. What is the shortest distance between two seats, located on either side of the center of the row, at which this tone cannot be heard well? 3 . A certain string (F xed at both ends) will vibrate in a standing wave at a frequency of 113 Hz. The speed of the waves along the string is 270 m/s. How far apart are the nodes? 4. Two guitar strings (F xed at both ends) are identical in every respect (including tension, etc.) except for their lengths. String A is 0.725 m long and is vibrating at its 6th harmonic. String B is 0.486 m long. At which harmonic would you want string B to vibrate in order to minimize the beat frequency you would hear when

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## This note was uploaded on 03/27/2010 for the course PH 202 taught by Professor Staff during the Spring '08 term at Oregon State.

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HW5 - Oregon State University Physics 202 HW5 Winter Term...

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