1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Confused by canceling sound waves

  1. Mar 6, 2005 #1
    I'm confused by this problem: [​IMG]
    Can someone explain the solution and what's wrong with my reasoning?
    It takes 1.7/340 = .005 sec for the wave to travel the 1.7m. So for the waves to cancel woudn't .005 = T * 1/2 * n (where T is the period of the wave and n is an integer)? Since T= 1/f, we have f = 100n. But then f could be 200hz, 300hz, or 400hz, so that must be wrong... :frown:
  2. jcsd
  3. Mar 6, 2005 #2


    User Avatar
    Homework Helper

    For destructive interference, the distance must be an odd multiple of the half-wavelength. If it were an even multiple, that would be constructive interference.
  4. Mar 6, 2005 #3
    oh wow duh that was obvious :blushing: thanks!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Confused by canceling sound waves
  1. Sound wave confusion (Replies: 6)

  2. Waves and Sound - (Replies: 1)

  3. Sound Waves (Replies: 3)

  4. Sound Wave (Replies: 1)