If the TV telecast is to cover a radius of 120 km ( Given , the radius of the earth = 6400 km ), the height of the transmitting antenna is
If the TV telecast is to cover a radius of 120 km ( Given , the radius of the earth = 6400 km ), the height of the transmitting antenna is
A. 1280 m
B. 1125 m
C. 1560 m
D. 79 m
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Correct Answer - B
As ` d=sqrt(2hR)`
`implies h=(d^(2))/(2R) =((120 xx 1000)^(2))/(2 xx 6400xx 1000)=1125m`
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