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Homework Help: Estimating the peak electric field

  1. Apr 25, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the peak electric field inside a 690 W microwave oven under the simplifying approximation that the microwaves propagate as a plane wave through the oven 's
    775 cm^2 cross-sectional area.

    3. The attempt at a solution

    ave, intensity (s) = ave power (p)/ 4*pie*r^2

    so in this formula i substituted ave.S=E^2/ 2* 4*pie*10^-7 *3*10^8

    and i got E^2 = (p)(2)(4*pie*10^-7)(3*10^8)/ (4*pie) (r^2)

    and when i plug in all the #s
    its E^2 = (690 W) (2)( 4*3.14*10^-7 N/m^2) (3*10^8 m/s)/ (4*3.14)(7.75 m^2)

    = 53.419 V/m
    i get this answer
    am i mistaking somwhere?
    plez help to get me a right answer....thanx!!!!!
  2. jcsd
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