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Frequency of sound detected by microphone

  1. Jul 19, 2014 #1
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution

    first, i find the wavelength of sound = 330/1100= 0.3m

    then, I find the frequency of rise and fall of intensuty of sound = 3/0.3 = 10hz..
    but the ans is 20hz. which part is wrong?
     

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  3. Jul 19, 2014 #2

    Doc Al

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    Staff: Mentor

    How does the intensity of the sound vary along the line between X and Y? Where are the peaks?
     
  4. Jul 19, 2014 #3

    NascentOxygen

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    Staff: Mentor

    I reckon the part that's wrong might be right near the start, when you told yourself that this is too straight-forward to bother sketching any diagram. :wink:

    How about drawing the two speakers and what you're expecting to find between them?
     
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