Question

A TV transmission tower has a height of 240 m. Signals broadcast from this tower will be received by line of sight communication at a distance of

(Radius of earth = 6.4 x 106 m)

• A. 100 km
• B. 110 km
• C. 55 km
• D. 120 km

Answer 1

Answer: (C)

55 km

Answer 2

: Here , $h = 240m,R = 6.4 \times 10^{6}m$

The maximum distance on earth from the transmitter upto which a signal can be received is

$d = \sqrt{2Rh} = \sqrt{2 \times (6.4 \times 10^{6}) \times 240}$

$= 55.4 \times 10^{3}m = 55.4km$