For VHF signal broadcasting, _________km2 of maximum service area will be covered by an antenna tower of height 30 m , if the receiving antenna is placed at ground. Let radius of the earth be 6400 km. (Round off to the Nearest Integer) (Take

For VHF signal broadcasting, _________km² of maximum service area will be covered by an antenna tower of height 30 m , if the receiving antenna is placed at ground. Let radius of the earth be 6400 km. (Round off to the Nearest Integer) (Take $\pi$ as 3.14)
Option: 1 1206
Option: 2 13
Option: 3 45
Option: 4 56

Answers (1)

A avinash.dongre

$\begin{array}{l} \mathrm{d}=\sqrt{2 \mathrm{Rh}} \\ \mathrm{A}=\pi \mathrm{d}^{2} \\ \mathrm{~A}=\pi 2 \mathrm{Rh} =3.14 \times 2 \times 6400 \times \frac{30}{1000} \\ \mathrm{~A}=1205.76 \mathrm{~km}^{2} \\ \mathrm{~A}=1206 \mathrm{~km}^{2} \end{array}$