Which type of wave is primarily used for radio communication?

Electromagnetic waves are primarily used for radio communication due to their ability to propagate through space without the need for a medium. These waves, which include radio waves, have varying frequencies and wavelengths, making them suitable for transmitting information wirelessly over long distances.

Radio communication relies on the transmission and reception of these electromagnetic waves, as they can carry audio signals, data, and other forms of information. Unlike mechanical waves, which require a material medium like air or water to travel, electromagnetic waves can move through the vacuum of space, allowing for greater range and versatility in communication applications.

Sound waves, on the other hand, are mechanical waves that require a medium (like air) to travel and cannot propagate through a vacuum. Thermal waves are also not a form of communication wave; they are related to the transfer of heat and do not serve the function of transmitting information. Thus, the unique properties of electromagnetic waves make them the ideal choice for radio communication.