A TV remote control unit uses radio waves to communicate with the TV set. Radio waves are a type of electromagnetic radiation that can transmit signals wirelessly over short distances. The remote control sends out a specific signal in the form of radio waves when a button is pressed. This signal is received by a sensor in the TV set, which interprets the command and performs the corresponding action, such as changing the channel or adjusting the volume.

Radio waves are well-suited for remote control applications because they can travel through walls and other obstacles without the need for a direct line of sight between the remote and the TV set. The remote control and the TV set are equipped with specialized components, such as transmitters and receivers, that enable them to send and receive radio wave signals.

When a button is pressed on the TV remote control, it generates an electrical signal that is converted into a radio wave by the remote`s transmitter. This radio wave carries the encoded information about the specific command. The TV set`s receiver, tuned to the same frequency as the remote control, detects and decodes the radio wave signal, allowing the TV set to respond accordingly.

Overall, the use of radio waves in TV remote control units provides a convenient and reliable means of operating a TV set from a distance without the need for direct physical contact.