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Homework Help: Phase difference question

  1. Sep 15, 2008 #1
    1. The problem statement, all variables and given/known data
    Two Loud speakers are placed on a wall 3.79 meters apart. A listener stands directly in front of one of the speakers, 65.6 meters from the wall. The speakers are being driven by the same electric signal generated by a harmonic oscillator of frequency 4010 Hz The speed of sound in Air is 343 m/s. What is the phase difference [tex]\Delta\Phi[/tex] between the two waves? (answer in radians)

    2. Relevant equations
    y = A sin (kx (+/-) [tex]\omega[/tex]t

    3. The attempt at a solution
    I tried finding the wavelength and using trig to find the distance between the observer and speakers...but I'm not sure if it has anything to do with the problem, and I haven't gotten an answer out of this yet...I'm lost. The only thing I know is superposition, but I know that if you just add sin to sin, you don't just get sin, and I don't know how to derive that to see how that works....

  2. jcsd
  3. Sep 15, 2008 #2


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    Homework Helper

    Sure it does. The difference in distance is going to determine what lag there is between the 4010 hz sound waves.
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