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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 332. Now, in Eq. 3332 for a totally absorbing area
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 Spring '08
 Any
 Physics, Power

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