JEE Main202329 Jan 2023Morning ShiftPhysicsCommunication SystemActual
If the height of transmitting and receiving antennas are 80 m each, the maximum line of sight distance will be : Given : Earth’s radius = 6 . 4 × 10 6 m .
Options
- A32   km
- B28   km
- C36   km
- D64   km
Correct answer
D. 64   km
Step-by-step solution
Given: R = 6 . 4 × 10 6   m Using the relation between the range of the radio communication and the height of the transmission antenna h T and the receiving antenna h R , the maximum line of sight distance between two antennas, is d max = 2 R h T + 2 R h R ⇒ d max = 2 × 2 × 6 . 4 × 10 6 × 80 = 64000   m = 64   km