A TV tower has a height of 100m. How much population is covered by the TV broadcast if the average population density around the tower is 1000 km−2 ? (radius of earth = 6.4 ×106m).
A
4×105
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B
5×105
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C
4×106
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D
8×107
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Solution
The correct option is C4×106 Here, h=100m, Re=6.4×106m Average population density= 1000km−2=10−3m−2 TV transmission range, d=√2hRe Therefore, area of TV transmission range A=πd2=2πhRe=2×3.14×100×6.4×106=4×109m2 Therefore, population covered by TV broadcast= 4×109×10−3=4×106