The height of a TV tower is 180 m. To what distance the transmission can be made from this tower, if the radius of earth is $6.4 × 10^6 m$?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 48 km
The distance (d) on the horizon,
$d=\sqrt{2Rh}$ [h = height of tower]
$=\sqrt{2×(6.4×10^6)×180}$
$≃4.8×10^4m=48km$