Question

Which of the following frequencies will be suitable for beyond-the-horizon communication using sky waves?(a) 10 kHz(b) 10 MHz(c) 1 GHz(d) 1000 GHz

Answer 1

It is necessary for the signal wave to travel large distances for beyond-the-horizon communication using sky waves. Frequency of 10 kHz requires very large antennas. The high energy signal waves ( 1 GHz to1000 GHz ) penetrate the ionosphere.

Thus, signal waves of 10 MHzfrequencies are most suitable for beyond-the-horizon communication because they easily get reflected from the ionosphere.

Thus, option (b) is correct.