Properties of waves include speed, frequency and wavelength. All light travels at a speed of 3 s 108 m/s in a vacuum. The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays. Example: Radio waves: Low energy waves with long wavelengths. Includes FM, AM, radar and TV waves. Used in many devices such as remote control items, cell phones, wireless devices, etc.