Is it necessary for a transmitting antenna to be at the same height asthat of the receiving antanna for line of sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover, if the receiving antena is at the ground level?

Options

A. `3800 km^(2)`
B. `3260 km^(2)`
C. ` 7400 km^(2)`
D. `3320 km^(2)`

Answer

B

Explanation

Range `, d=sqrt(2hR )`
`:.` Service area ` = pi xx 2hR `
`=(22)/(7) xx 2 xx 81 xx 6.4 xx 10^(6)`
`= 3258.5 xx 10^(6) m^(2)= 3258.5km^(2)=3260 km^(2)`