An antenna has U max = 10 W/sr, U ave = 4.5 W/sr, and r =

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An antenna has Umax  = 10 W/sr, Uave = 4.5 W/sr, and η= 95%. The input power to the antenna is

(a) 2.222 W
(b) 12.11 W 

(c) 55.55 W

(d) 59.52 W

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