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Looking for speed using the wave equation

  1. Jan 12, 2017 #1
    1. The problem statement, all variables and given/known data
    phi(x,t) = A e *[-a(bx+ct)*2]
    I'm trying to find the speed of the equation
    2. Relevant equations
    f(x+vt) +vt which means it is in the negative x-direction
    f(x)= e^-ax^2
    plugging in x'=x+vt
    A e *[-a(bx+ct)*2]
    where a= constant A= amplitude v=c= speed of light

    3. The attempt at a solution
    I know that is speed = w(angular frequency)/K
    This issue that I am having is that I don't have any number besides c which is the speed of light
    I know that I can use partial fractions [partial phi/ partial t]divided by [partial phi/ partial x] but I'm not allowed to use that way. What is another way I can solve this problem
  2. jcsd
  3. Jan 12, 2017 #2
    Last edited: Jan 13, 2017
  4. Jan 19, 2017 #3

    rude man

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    Homework Helper
    Gold Member

    ANY function f(x + vt) is a wave traveling in the -x direction with speed v.
    Consider: at t=x=0 the function is max = A. For t>0 what values of x maintain the value f=A?
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