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Homework Help: Intensity of EM radiation for two incoherent waves?

  1. Apr 27, 2009 #1
    1. The problem statement, all variables and given/known data

    Two incoherent EM waves of intensities 10I0 and 14I0 travel in the same direction in the same region of space. What is the intensity of EM radiation in this region?

    2. Relevant equations

    I = I1+I2 + 2√(I1I2) or
    I = I1+I2 - 2√(I1I2)

    3. The attempt at a solution

    I tried using the above formula adding AND subtracting (using 10 and 14 as my I1 and I2), but keep getting the answer wrong. I'm not sure how to go about this problem even though it seems simple.
    Can anyone offer any insight? Thanks.
  2. jcsd
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