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Billy and speakers

  • Thread starter axgalloway
  • Start date
  • #1

Homework Statement



Two lound speakers are each located 16m from a wall and are 0.8m apart. They play a 3000 Hz sound, both speakers are in phase. Bill is located at the wall at the m=0 maximum of sound interference. If he walks along the wall, how far does he have to walk to hear m=1 maximum? (The speed of sound is 343 m/s.)


Homework Equations



2pi * (x2-x1) / lambda = 2mpi
vsound = lambda*f


The Attempt at a Solution



343 m/s = lambda*3000Hz
lambda= .1143 meters

Beyond that, I do not know how to solve it.
Thank you.
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
3,090
4
Sounds like you have a little geometry problem. Don't you just need to find the point away from the mid-line whose distance from each speaker is different by half a wavelength?
 

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