A ratio has a power of 1 kW and is opera...

A ratio has a power of `1 kW` and is operating at a frequency of `10 GHz` it is located on a mountain top of beigh `500 m ` The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth ` = 6.4 xx 10^(6) m )` is

80 km

16 km

40 km

64 km

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