Question

Sky wave propagation is used in:

• A. radio communication
• B. satellite communication
• C. TV communication
• D. Both TV and satellite communication

Hint:

Sky wave propagation is used in long-distance radio communication, where the waves are reflected by the ionosphere.

Answer 1

The Correct Option is A

Step 1: Understanding sky wave propagation.
Sky wave propagation refers to the transmission of radio waves that are reflected by the ionosphere back to Earth, primarily used in radio communication.
Step 2: Explanation.
It is mainly utilized in radio communication and not in satellite or TV communication, which use different propagation methods.
Final Answer: \[ \boxed{\text{A) radio communication}} \]