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!

Homework Help: Reflected wave equation

  1. May 28, 2006 #1
    Consider a progressive wave represented by the equation,
    y = A[sin(wt – kx)]
    If it is reflected from a wall, what will probably be the equation of the reflected wave?
    I think it is y = A1[sin(wt + kx)]
    Is it right? Should a negative sign be given to the expression? Will there be a phase change of pi assuming the wall to be rigid boundary?
    Last edited: May 28, 2006
  2. jcsd
  3. May 28, 2006 #2
    There will be a phase change of [itex]\pi[/itex] if the wall is of a denser medium than the incident medium. Since the wall is rigid, this is correct. [itex]A_{1}[/itex] is determined from considerations of boundary conditions. That will tell you whether there should be a minus sign or not. You don't have to "give" it a negative sign.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook