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S11_Practice_midterm_1

# S11_Practice_midterm_1 - Physics 1B Spring 2011 Practice...

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Physics 1B – Spring 2011: Practice Midterm 1 Problem 1: Consider two speakers, both on the y-axis, separated by a distance d=2 meters, and with the bottom speaker at the origin. Each speaker emits the same sound wave, in phase, with frequency f 0 = 514 Hz. a) Determine which on the positive x-axis will exhibit constructive and destructive interference b) The top speaker is now removed, and a moving reflecting surface is placed to the right of the remaining speaker and is moved toward it with speed v surface =2 m/s. What frequency would a listener standing at the location of the speaker hear reflected back from the moving surface?

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Problem 2: This problem walks you through a derivation of standing waves produced by two speakers. You will need the angle addition formula for cosines: cos(a+b) = cos(a)cos(b) - sin(a)sin(b) a) Consider two speakers on the x-axis a distance D apart from each other. Each emits a wave with the same wavelength, frequency, and phase (you can take the phase to be 0) in all directions.
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