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8.Electromagnetic waves
easy
A TV tower has a height of 100 m. The average population density around the tower is 1000 per $km^2$. The radius of the earth is $6.4 \times {10^6}$m. the population covered by the tower is
A
$2 \times {10^6}$
B
$3 \times {10^6}$
C
$4 \times {10^6}$
D
$6 \times {10^6}$
Solution
(c)Population covered $= 2 \pi hR ×$ Population density
$= 2 \pi × 100 × 6.4 × 10^{6} × \frac{{1000}}{{{{({{10}^3})}^2}}} = 4 × 10^{6}$
Standard 12
Physics
