Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: What is the Path Difference: Waves

  1. Apr 11, 2012 #1
    1. The problem statement, all variables and given/known data
    Two in-phase speakers 4.50 m apart in a plane are emitting 1690 Hz sound waves into a room where the speed of sound is 343 m/s. Consider a point that is 8.50 m in front of one of the speakers, perpendicular to the plane of the speakers. What is the path difference (in wavelengths) between the two sound waves at this point?

    2. Relevant equations
    Hypotenuse Equation....

    3. The attempt at a solution
    Since the speakers are 4.50 m apart, and the point is perpendicular to one of the speakers, it essentially makes the shape of a triangle. I find the hypotenuse, which is 9.6178 m, and then subtract 8.50 m from it to find the path difference. But that answer is not right :( What should I be doing..?
  2. jcsd
  3. Apr 11, 2012 #2


    User Avatar
    Homework Helper

    You've got the path difference in meters, but the question asks for the path difference in wavelengths. You're halfway there.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook