What is a characteristic of radio waves?

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Radio waves are characterized by their ability to travel long distances and penetrate various materials, which makes them essential for communication technologies, such as radio and television broadcasting, as well as cell phone signals. Their longer wavelengths, compared to those of visible light and other electromagnetic waves, allow them to diffract around obstacles and pass through walls and buildings more effectively than higher frequency waves. This unique property is why radio waves are commonly used for transmitting information over great distances.

In contrast, the other characteristics described in the options do not apply to radio waves. For example, radio waves have much longer wavelengths than any visible light, which rules out visibility to the human eye. Additionally, they carry less energy than X-rays, which belong to a different part of the electromagnetic spectrum with much shorter wavelengths and higher energy levels. Therefore, the distinguishing factor of radio waves is indeed their capacity to travel long distances and penetrate various materials.