1. The study of radio waves in the media technology, beyond AM radio broadcasting.

8. Figure 1 Radio waves are invisible waves that carry data, music, sound or pictures. Microwaves can be used to transmit signals for mobile phone calls. Microwave transmitters and receivers on buildings communicate with mobile phones that are in range. Infrared is used for military use such as surveillance, tracking and night vision and civilian use such as wireless communication, remote controls and radio forecasting. Ultraviolet is found in sunlight, like radio waves it is invisible and skin reacts to it by turning darker. to much exposure to this can cause cancer. Visible light is light that the human eye can see, it is responsible for the human sight. A primary source is the sun. X-ray is used for observing the internal structure of objects medical use and also used in the airport Gamma ray can be use for sterilising food and medical equipment, also detection and treatment of cancer.