Question

Which of the following frequencies will be suitable for the horizontal communication using sky waves?

• A. 1 GHz
• B. 10 MHz
• C. 1000 GHz
• D. 10 KHz

Answer 1

The correct option is B

10 MHz

Waves of frequency 10 MHz will be reflected by the ionosphere and hence can be propagated through sky waves. Waves of 10 KHz cannot be radiated because they require an antenna of very large height. Waves of 1 GHz and 1000 GHz will penetrate the atmosphere and will not be totally reflected back.