NTA Abhyas JEE Main2020PhysicsCommunication SystemPractice
The radius of the Earth is 6400 km . If the height of an antenna is 500 m , then its range is
Options
- A800   km
- B100 km
- C80 km
- D10 km
Correct answer
C. 80 km
Step-by-step solution
Given, R = 6400 k m = 6.4 × 10 6 m , h = 500 m ∴ R a n g e , d = 2 h R = 2 × 500 × 6.4 × 10 6 = 64 × 10 8 = 8 × 10 4 = 80 k m