Question Pool -- Category G0C

If the free-space far-field power density of a 18-MHz Yagi antenna measures 10 milliwatts per square meter at a distance of 3 wavelengths, what will it measure at a distance of 6 wavelengths?
A.
11 milliwatts per square meter
B.
5.0 milliwatts per square meter
C.
3.3 milliwatts per square meter
D.
2.5 milliwatts per square meter

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