1. Limited time only! Sign up for a free 30min personal 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!

Reflection of wave

  1. Aug 25, 2011 #1
    How is a wave reflected in a open pipe?
     
  2. jcsd
  3. Aug 25, 2011 #2

    K^2

    User Avatar
    Science Advisor

    You mean a sound wave traveling inside a pipe getting reflected back from open end? Mathematically, what you get is a boundary conditions P=constant at the end, which means reflection is the only possible solution. But that might not help you. You probably want to picture what actually happens with the moving air.

    Imagine a pressure wave approaching the end of the pipe. The way the pressure wave travels is by compressing air ahead of it and decompressing air behind it, so you end up with an area of lower pressure behind the wave. Imagine that pressure wave reaching the open end. The high pressure zone almost immediately disperses (turning into a spherical wave outside the pipe) but that still leaves the low pressure zone inside the pipe. That pulls some air back into the pipe from outside, which keeps moving inside the pipe by inertia, and basically launches a wave in reverse.

    Does that help?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Reflection of wave
Loading...