. 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 500m. The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth = 6.4 x 106 m) is
A. 80 km
B. 16 km
C. 40 km
D. 64 km
Best Answer
Ans: A
Sol: ||| Let us assume that the maximum distance on earth where object can be detected is d, then
(h + R)2 = d2 + R2
h2 + R2 + 2hr = d2 + R2
d2 = h2 + 2Rh
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