Question

A receiving station on the ground is receiving a signal of frequency 5MHz from a transmitter at a height of 300m above the surface of the earth (of radius 6.4 x 10⁶m) at a distance of 100km from the receiver. Then the signal is coming via 

(a) ground wave propagation 

(b) sky wave propagation 

(c) both ground wave and sky wave propagation 

(d) neither ground wave nor sky wave propagation

Answer 1

The correct option (b) sky wave propagation

Explanation:

For ground wave propagation, the maximum range is

Which is more than 5 MHz. Hence a 5 MHz signal can be propagated via sky waves and not via ground waves. Thus the correct choice is (b)