Question Pool -- Category G0C

If the free-space far-field power density of an antenna measures 9 milliwatts per square meter at a distance of 5 wavelengths, what will the field strength measure at a distance of 15 wavelengths?
A.
3 milliwatts per square meter
B.
1 milliwatt per square meter
C.
0.9 milliwatt per square meter
D.
0.09 milliwatt per square meter

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