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!

Compression/longitudinal wave equation

  1. Apr 2, 2012 #1

    Leb

    User Avatar

    This is not really a homework problem, I do not understand the concepts. The attachment below is as informative as the slides provided are. The course seems to be based on H.J. Pain's book "waves and vibrations".
    Waves.jpg

    I know that the information provided is limited, but there is little I can provide more on this question, hopefully someone can explain what is going on. I am embarrassed to ask my lecturer as he assumed it to be straightforward.

    1) Firstly, is the beam bellow showing what is happening with the same slices of the beam at some later time ?
    2) Why is psi (up to that point the notation was for the usual wave equation psi = Aexp(kx-wt) ) and psi + delta psi pointing inward ? Is psi + delta psi supposed to mean a reflected wave ?
    3) With the "compression" case (on the left) are the forces pointing outward because some kind of restoring force is being shown ?
    4) Why is the pressure wave (also it was called the acoustic wave) different from longitudinal compression wave ?
    5) What is A(p + psip) ? The force ? Why is it pointing inwards now ?

    Thanks !
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted



Similar Discussions: Compression/longitudinal wave equation
Loading...