What defines Radio Frequency (RF)?

Radio Frequency (RF) is defined as any frequency of electromagnetic energy capable of propagation into space. This encompasses a wide range of frequencies, specifically those between 3 kHz and 300 GHz, which are used for various forms of communication, including radio and television broadcasting, as well as mobile communications and Wi-Fi.

The definition emphasizes the electromagnetic nature of RF and its ability to travel through various mediums, including air and vacuum, making it crucial for wireless communication technologies. Unlike the other options, which are more restrictive or specific, this definition accurately captures the broad and versatile character of RF waves and their roles in numerous applications beyond just television or sound frequencies.