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Homework Help: Interference and diffraction

  1. Jan 24, 2009 #1
    1. The problem statement, all variables and given/known data

    Two loud speakers emit sound waves of the same wavelength.When a microphone is moved between them quiet places are observed 20cm apart.What is the wavelength of the sound waves?
    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 24, 2009 #2
    You need to show your attempt at a solution.Are the speakers facing eachother?
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