ch33-p104 - 104. Since intensity is power divided by area...

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104. Since intensity is power divided by area (and the area is spherical in the isotropic case), then the intensity at a distance of r = 20 m from the source is I P r == 4 0 040 2 π .. Wm 2 as illustrated in Sample Problem 33-2. Now, in Eq. 33-32 for a totally absorbing area
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