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

A radar has a power of 1 kW and is operating at a frequency of 10 GHz. It is located on a mountain top of height 500 m. The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth = `6.4 xx 10^5 m`) is :

A

80 km

B

16 km

C

40 km

D

64 km.

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