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Homework Help: Wave interference equations help

  1. Jan 23, 2008 #1
    1. The problem statement, all variables and given/known data

    Does anyone know the equations for these? Or a website that could help? I lost my notes about them and I can't find anything on the internet. I have a worksheet of 15 problems and I only have these three left! :biggrin:

    A string is attatched to a post at one end. Several pulses of amplitude .15 m sent down the are refelcted back at the post and travel back down the string without loss of amplitude. What is the amplitude at a point on a string where the maximum displacement points of two pulses cross? What type of interferance is this? How would your answer change if the same pulses were sent down a string whose end is free? What type of interfrence is this?

    A streched string fixed at both ends is 2.0 m long. What are three wavelengths that will produce standing waves on this string. Name at least one wavelength that would not produce a standing wave pattern.

    2. Relevant equations

    That's what I need to know! :cry:

    3. The attempt at a solution

    I've made a few attempts and it has become clear to me (almost one and a half hours later) that I need help before I continue.

    :EDIT: I figured one out on my own!

    Any help is greatly welcomed. :smile:
    Last edited: Jan 24, 2008
  2. jcsd
  3. Jan 24, 2008 #2
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