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Homework Help: Destructive Interference and Min. Distance

  1. Apr 29, 2009 #1
    1. The problem statement, all variables and given/known data

    A steep cliff west of Lydia's home reflects a 1205 kHz radio signal from a station that is 63 km due east of her home. If there is destructive interference, what is the minimum distance of the cliff from her home? Assume there is a 180° phase shift when the wave reflects from the cliff.

    2. Relevant equations
    delta l = (m + .5) * wavelength
    delta l = d sin theta
    A = l A1 - A2 l
    I = I1 + I2 - ( 2 * (square root of I1 * I2))

    3. The attempt at a solution

    I have no idea how to start, I know I can find the wavelength but unsure how that relates to distance or how to find the distance from that.
  2. jcsd
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