Q .     A T.V. transmitting Antenna is `128\ m` tall. If the receiving Antenna is at the ground level, the maximum distance between them for satisfactory communication in L.O.S. mode is:
[Radius of the earth `=6.4\times 10^6\ m`]

EAMCET 2014
A

`64\times \sqrt{10}\ km`

B

`\frac{128}{\sqrt{10}}\ km`

C

`128\times \sqrt{10}\ km`

D

`\frac{64}{\sqrt{10}}\ km`

HINT

Distance between the antennas: ` d = \sqrt{2h_TR} `
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