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 = 6.4 × 10 6 m) is :
Text Solution
Verified by ExpertsThe correct answer is:
A
r = R + h 
R
x = 
= 
x 2 = 25000 + 2. 500 6.4 100000
= 25000 + (64 × 100000000)
= 10 4 (640025)
x 2 
10 4 .640000
x = 8 × 10 4 m
= 80 km.
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