Q. The distance of coverage of a transmitting antenna is 12.8 km. Then, the height of the antenna is (Given that radius of earth = 6400 km)
A) 6.4 m
B) 12.8 m
C) 3.2 m
D) 16 m
Explanation
(b) Given $d = 12.8\ km,\ R = 6400\ km$
We have $d = \sqrt{2hR}$
$h = \frac{d^{2}}{2R} = \frac{(12.8)^{2}}{2 \times 6400} = 12.8\ m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.