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The radius of earth is 6400 km . If height of the antenna is 500m, then its range is

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300km

800km

100km

80 km

answer is C.

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Detailed Solution

$d = \sqrt{2 R h}$

$\begin{array}{l} = \sqrt{2 \times 6400 \times 1000 \times 500} \\ = 8 \times 10^{4} = 80 k m \end{array}$

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