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Homework Help: Superposition of waves

  1. May 4, 2007 #1
    1. The problem statement, all variables and given/known data

    superposition.jpg



    2. The attempt at a solution

    i knew how to solve questions one and three..please help me in question number 2...here is what i did....


    Question 1

    (2*pi*x)/(wavelength)=pi/3

    where x is the distance between the two waves (5cm)

    and therefore we get the wavelength = 30cm



    Question 2

    (2*pi*x)/30 - wt = difference in phase

    (2*pi*x)/30 - (2*pi*f)(7.5*10^-3) = difference in phase

    is this correct,,if so how can i get x ..because i think it would be different


    Question 3

    v = wavelength * frequency
    = 0.3*45
     
    Last edited: May 4, 2007
  2. jcsd
  3. May 4, 2007 #2
    can anybody help...plz
     
  4. May 4, 2007 #3
    i tried myself and i got the correct answer for question number 2

    difference in phase = wt
    difference in phase = (2*pi*f)(7.5*10^-3)
    difference in phase = (2*pi*45)(7.5*10^-3)

    then divide by pi ..to get the answer as a multiple of pi
     
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