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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Units and Measurement
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A Tv transmitting antenna is $128$ m tall. If the reactivating antenna is at the ground level, the maximum distance between them for satisfactory communication is LOS mode is (R of earth $=6.4 \times 10^6 m)$

$\begin{array}{1 1} 64 \sqrt {10} km \\ \frac{128}{\sqrt {10}} \\ 128 \sqrt{10} km \\ \frac{64}{\sqrt {10}}km \end{array} $

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