Question

The radius of the Earth is 6400 km. If the height of an antenna is 500 m, then its range is

• A. 800 km
• B. 100 km
• C. 80 km
• D. 10 km

Answer 1

Answer: (C)

$d=\sqrt{2h_{T}R}=\sqrt{2\times 500\times 6400000}$
$=\sqrt{10^3\times 64\times 10^5}$
$=8\times 10^4=80km$