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By what percentage will the transmission range of a T.V. tower be affected when the height of the tower is increased by 21 %?

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By what percentage will the transmission range of a T.V. tower be affected when the height of the tower is increased by 21 %?

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 Transmission range of a TV tower

d = √2hR

If height is increased by 21 %, new height h' = h +21/100h = 1.21h

If d’ is the new range, then

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