Question
Question: A transmitting antenna of height 20 m and the receiving antenna of height *h* are separated by a dis...
A transmitting antenna of height 20 m and the receiving antenna of height h are separated by a distance of 40 km for satisfactory communication in line of sight mode. Then the value of h is
(Given radius of the earth is 6400 km)
A
40 m
B
45 m
C
30 m
D
25 m
Answer
45 m
Explanation
Solution
: dM=2RhR+2RhT
Where hRandhTare the heights of receiving and transmitting antenna and R is the radius of the earth
40×103=2×6400×103×h+2×6400×103×20
40×103=2×6400×103×h+16×103
h=2×6.4×106[(40−16)×103]2=45m