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 1000km−2?
A
4.0×106
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B
8.0×106
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C
4.0×104
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D
8.0×104
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Solution
The correct option is A4.0×106 h=100m, Re=6.4×106m,Pdensity=10−3m−2,Pcov=Pdensity×Area =10−3×π×d2 ......(1) where, d=√2hRe so, d2=2hRe putting in eq.(1).