Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Dumb question about waves

  1. Feb 10, 2008 #1
    Suppose I have a FINITE wave train, ( of an unspecified nature), and it propagates along say the positive x axis with a constant speed v and without any change of shape. Now which differential equation it MUST satisfy? The normal wave equation or the Schrodinger's equation?
     
  2. jcsd
  3. Feb 10, 2008 #2

    pam

    User Avatar

    The normal wave train. The shape of f(x-vt) is unchanged in the wave equation.
    Since the Schrodinger equation involves d^2/dx^2 and d/dt, the shape will change.
     
  4. Feb 10, 2008 #3
    You have the same derivates in the normal wave equation.
     
  5. Feb 10, 2008 #4

    pam

    User Avatar

    The normal wave equation has d^2/dt^2.
     
  6. Feb 11, 2008 #5
    Yes, it's true.
     
  7. Feb 12, 2008 #6
    Ok so what if i havent specified that the shape changes or not? I thought the schrodinger's eqn was like the universal wave equation of sorts!
     
  8. Feb 13, 2008 #7

    pam

    User Avatar

    Because the Schrodinger equation is first order in time, it is more like the dispersion equation
    (but with i d/dt) than the wave equation.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Dumb question about waves
  1. Question about waves (Replies: 1)

Loading...