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Question

A TV tower has a height of 100 m. How much population is covered by the TV broadcast if the average population density around the tower is 1000 km2 ? (radius of earth = 6.4 ×106 m).

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 C 4×106
Here, h=100 m, Re=6.4×106m
Average population density= 1000 km2=103 m−2
TV transmission range, d=2hRe
Therefore, area of TV transmission range
A=πd2=2πhRe=2×3.14×100×6.4×106=4 ×109 m2
Therefore, population covered by TV broadcast= 4×109×103=4×106

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