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A T.V. transmission tower at a particula...

A T.V. transmission tower at a particular station has a height of `160 m` .
(a) What is its coverage range ?
(b) How much population is covered by transmission , if the average population density around the tower is `1200 km^(-2)`?
( c ) By how much the height of tower be increased to double its coverage range ?
Given radius of earth ` = 6400 km`.

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