Final answer:
Radio waves are discussed as a group because they represent a broad category of electromagnetic waves with similar frequencies regardless of their source.
Step-by-step explanation:
Radio waves are discussed as a group because they represent a broad category of electromagnetic waves with similar frequencies regardless of their source. They are commonly used for audio communication and have wavelengths greater than about 0.1 m. The term 'radio waves' is applied to electromagnetic waves in this range regardless of their application. Different waves within the radio wave category can have different frequencies and wavelengths, but they are all grouped together based on their characteristic properties.