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Homework Help: Waves and light (mc)

  1. Oct 24, 2011 #1
    1. The problem statement, all variables and given/known data

    A two point source interference pattern is generated in a ripple tank by identical sources vibrating in phae and located 12.0cm apart. there are seven nodal lines observed on each side of the centre line. if the wavelength of the sources is doubled and they remain in phase

    a) the number of nodal lines observed doubles
    b) the frequency doubles
    c) the speed of the wave doubles
    d) the number of nodal lines decreases to half
    e) the average distance between nodal lines decreases

    2. Relevant equations

    sintheta = Xn/L = (n-1/2) λ/d

    am i solving for n? or Xn

    3. The attempt at a solution

    im not sure how to solve this mathematically.
    the answer is d)
    please help me
  2. jcsd
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