A radar of power 1 kW and is operating at a frequency of 20 GHz. It is located at a height of 1 km on a mountain. The maximum distance up to which it can detect object located on the surface of earth (Radius of earth = $6.4 × 10^6 m$) is:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 113 km