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What should be the height of transmitting antenna if the T.V. telecast is to cover of a radius of `128 km`? Radius of earth` = 6.4 xx 10^(6) m`.

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What should be the height of transmitting antenna if the T.V. telecast is to cover of a radius of `128 km`?
Radius of earth` = 6.4 xx 10^(6) m`.
A. 256 m
B. 640 m
C. 2500 m
D. 1280 m
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Correct Answer - D
`d=sqrt(2hR) therefore h=d^2/(2R)`
`=(128xx128xx10^6)/(2xx6.4xx10^6)`=1280 m
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