Final answer:
The correct answer is Radio, which converts sound to electromagnetic waves for transmission and uses an antenna to receive signals and convert them back into sound.
Step-by-step explanation:
The correct answer to the question is Radio. A radio operates by converting sound waves into electromagnetic waves, which are then transmitted across distances to be received by radios like the one in your car. These received signals induce a current in the antenna that is then amplified and decoded by the radio receiver to ultimately be transformed back into sound waves through the speakers. The process involves tuning into the appropriate radio frequency and can also entail modulation methods such as amplitude modulation (AM) or frequency modulation (FM).
Furthermore, antennas are crucial in this process as they are responsible for capturing the incoming electromagnetic signals. Whether for receiving or broadcasting, antennae can vary in shape and size, and are sensitive to different frequencies and wavelengths of electromagnetic waves.