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Homework Help: Destructive interference Sound question

  1. Apr 18, 2015 #1
    1. The problem statement, all variables and given/known data
    A student enters Best Buy prepared to buy a pair of speakers. Before he does so, he conducts an experiment with them. He places the speakers 4.0 m apart and connects a signal generator to both speakers that produces a single and consistent tone. (constant wavelength and frequency) He then walks to a point that is 2.0 m from one speaker and 2.3 m from the other. At that point he notices a quiet “spot”. If the speed of the sound in the room is known to be 350 m/s, calculate the possible frequencies being played by the speakers.

    2. Relevant equations
    PD = (n-1/2) λ

    3. The attempt at a solution
    No idea how to solve.
  2. jcsd
  3. Apr 18, 2015 #2
    How is a quiet spot generated?

    What does your equation mean?
  4. Apr 18, 2015 #3
    PD = path difference, so N would be the nodal line.
    I guess quiet spots are generated during points of destructive interference? Am I correct?
  5. Apr 18, 2015 #4
    Yes. So now you need to figure out where this is occurring in the problem.
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