If the area to be covered for TV telecast is doubles then height of transmitting antenna (TV tower) will have to be:

The area to be covered for TV telecast is doubled. Then the height of the transmitting antenna will have to be

(A) : The area to be covered for T.V. telecast is doubled, then the height of trans - mitting antenna will have to be doubled (R) : For T.V. signal propulation covered is equal to product of population density abd area covered

If a TV telecast isto cover a radius of 640 km, what should be the height of transmitting antenna?