The radius of the Earth is $6400$ km. If the height of an antenna is $500$ m, then its range is?

800

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100

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80

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10

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Solution

The correct option is C $80$ km
We know that Range $= \sqrt{2 R h} = \sqrt{2 \times 6400 \times 10^{3} \times 500}$
$= 80 \times 10^{3} m = 80 c m$ .

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