question_answer

A radar has a power of 1kW and is operating at a frequency of 10 GHz. It is located on a mountain top of height 500m. The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth ) is:                     [AIEEE 2012]

A) 80 km

B) 16 km

C) 40 km

D) 64 km

Correct Answer: A

Solution :

[a]

km.