The height of transmitting antenna if the TV telecast is to cover a radius of 128 km is

1560 m

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1280 m

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1050 m

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79 m

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Solution

The correct option is B 1280 m
$d_{m a x} = \sqrt{2 R H_{T}} = 128 k m \Rightarrow H_{T} = \frac{128^{2}}{2 \times 6400} = 1280 m$
Thus, height of the tower should be $1280 m$ .

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