The maximum line of sight distance `d_(M)` between two antennas having heights `h_(T)` and `h_()` above the earth is

Options

A. `sqrt(R(h_(T) + h_(R)))`
B. `sqrt(2R//(h_(T) + h_(R)))`
C. `sqrt(Rh_(T)) + sqrt(2Rh_(R))`
D. `sqrt(2Rh_(T)) + sqrt(2Rh_(R))`

Answer

D

Explanation

If heights of transmitting and receiving antennas be `h_(T)` and `h_(R)` respectively, then effective range will be
`d = (sqrt(2Rh_(T)) + sqrt(2Rh_(R)))`