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Homework Help: Examples of travelling and standing waves

  1. May 1, 2009 #1
    1. The problem statement, all variables and given/known data
    Give an example of a travelling wave AND a standing wave for:
    1 - Disturbances along a rope
    2 - Sound
    3 - Light

    2. Relevant equations
    None I can think of

    3. The attempt at a solution
    Hi, could someone please tell me if these are correct and, if not, what could I say instead?

    1 String - Travelling - Give one end of the rope a quick jerk up and down.
    Standing - Connect a string up to a frequency generator and increase the frequency until resonance occurs in the string - there is now a standing wave in the string.

    2 - Sound - Travelling - In an air-filled column with a piston at one end, move the piston back and forth.
    Standing - When you play a note on a musical instrument consisting of a pipe closed at one end (e.g. a saxophone), you are creating standing sound waves.

    3 - Light - Travelling - The light coming out of a torch.
    Standing - Shine two torches at each other.

  2. jcsd
  3. May 1, 2009 #2
    Only thing I would say is for light mention something related to coherent & monochromatic;

    perhaps a coherent & monochromatic laser at a very high quality mirror or something?
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