What is a key use of radio waves?

Radio waves are a type of electromagnetic radiation with longer wavelengths that make them particularly suitable for communication purposes. They are widely used to carry television, radio, and phone signals as they can easily travel through the atmosphere and penetrate buildings. The ability of radio waves to be modulated with information allows for effective transmission over long distances, making them essential for broadcasting audio and visual information to the public.

In contrast, the other applications mentioned, such as heating food, involve different types of electromagnetic waves, specifically microwaves. Medical imaging typically utilizes X-rays or other forms of radiation, while seeing in the dark often relies on infrared technology or other imaging systems, not radio waves. Thus, the use of radio waves for communication is a fundamental aspect of modern technology and a key reason they are significant in everyday applications.