In what frequency range do radio frequencies occur?

Radio frequencies encompass a range of electromagnetic waves that are used for communication and broadcasting. The correct frequency range for radio frequencies extends from approximately 3 kHz to 300 GHz. This range includes various sub-categories such as AM and FM radio, TV broadcasts, and satellite communications. The lower end of the range, starting at 3 kHz, captures the frequencies used for long-wave radio, while the upper end at 300 GHz includes microwave frequencies, which are essential for various forms of communication technologies, including mobile phones and Wi-Fi.

The other ranges provided do not accurately represent the full extent of radio frequencies. Frequencies below 3 kHz are typically classified as audio frequencies and do not fall within the radio frequency designation. Similarly, options that suggest narrower ranges or specify upper or lower bounds outside the 3 kHz to 300 GHz spectrum do not encompass the entirety of radio frequencies utilized in telecommunications. Therefore, the full spectrum defined by the selected option is crucial for understanding the range of frequencies used in radio communications.