A radio transmits and receives information through what medium?

The medium through which a radio transmits and receives information is electromagnetic waves. This is because radio technology is based on the principles of electromagnetic radiation, which include a range of frequencies referred to as radio waves. These waves can propagate through space and various materials, making them ideal for wireless communication.

Radio transmitters convert electrical signals into electromagnetic waves, which are then radiated into the environment. At the receiving end, antennas pick up these waves and convert them back into electrical signals. This fundamental principle allows for the transmission of audio, data, and other types of information over distances without requiring physical connections.

The other options refer to different forms of communication or transmission. While electric current is essential for powering radio equipment, it does not serve as the medium for transmission itself. Laser beams represent another form of communication using light and are not applicable in conventional radio systems. Sound waves, while they can carry information, require a medium such as air or water and are not suitable for the long-distance transmission that radio waves provide. Therefore, electromagnetic waves are the correct choice as they accurately describe the medium utilized in radio communication.