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Urgent: Interfering Waves

  1. Dec 13, 2006 #1
    1. The problem statement, all variables and given/known data
    A plane wave generator with a freqenecy of 60.0Hz creates a water wave of wavelength 3.0cm in region A of a ripple tank. The angle between the wave crests and straight boundary between regions A and B is 25.0 degrees in region A and 14.0 degrees in region B. Find the speed of the wave in each region.

    f = 60.0Hz
    lambda = 0.030 m
    thedaA = 25.0 degrees
    thedaB = 14.0 degrees
    vA = ?
    vB = ?

    2. Relevant equations

    I was thinking to use snell's law, but im not sure how to...

    3. The attempt at a solution

    General v...

    v = f x lamda
    v = 60 x 0.030
    v = 1.8 m/s

    Find vA

    vA/1.8 = Sin25/Sin14
    vA = 3.14 m/s

    Find vB

    vB/1.8 = Sin14/Sin25
    vB = 1.03 m/s
  2. jcsd
  3. Dec 14, 2006 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Yes, so this is already the velocity in region A.

    This looks ok at first sight.
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