Question

If a TV telecast is to cover a radius of 640 km,what should be the height of transmitting antena

Answer 1

Thus, the height of the antenna must be 32 km if it transmits over a radius of 640 km

Explanation:

The distance for which the TV antenna telecasts, D = 640 km

Radius of the earth = 6400 km

Let the height of the antenna be h km

Distance = √2hR

d^2=2hR

H = (640 x 640) / 2 x 6400

  = 32 km

Thus, the height of the antenna must be 32 km if it transmits over a radius of 640 km