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Speed of standing wave

  1. Feb 2, 2009 #1
    1. The problem statement, all variables and given/known data

    The standing wave in the picture is oscillating at 100 Hz. What is it's velocity?


    2. Relevant equations

    Velocity=(wavelength)(frequency)

    I believe is the equation that applies here.


    3. The attempt at a solution

    The wavelength from the picture appears to be 20x10-2 meters.

    So velocity should equal (20x10-2)(100)= 20 meters per second

    But I know this answer is wrong. Where am I going wrong?
     

    Attached Files:

  2. jcsd
  3. Feb 2, 2009 #2

    berkeman

    User Avatar

    Staff: Mentor

    Why do you say that the wavelength is 20cm? Draw a full cycle of a sine wave -- what does it look like?

    Also, be careful with your units. It looks like you are mixing cm and meters in your multiplication and answer....?
     
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