Radio waves range from 300 gigahertz (GHz), or a wavelength of 1 millimeter, to 3 kilohertz (kHz), which corresponds to a wavelength of 100 kilometers. Radio waves are the lowest frequency within the electromagnetic spectrum. The wavelength is the distance from the peak of one wave to the next.Continue Reading
The radio spectrum is typically divided into AM, or amplitude modulation, and FM, frequency modulation. AM waves vary in amplitude but have constant frequency and range from 540 to 1600 kilohertz. FM waves vary in frequency but are constant in amplitude, and range from 88 to 108 megahertz (MHz). Radio waves are not only used in radio transmission, but also in radar, satellite communications, computer networking, television transmission, short wave radio and certain medical procedures, such as magnetic resonance imaging.
Because they are a type of electromagnetic radiation, radio waves travel at the speed of light. The electromagnetic spectrum continues upward after the portion designated as radio waves. The next portion is devoted to microwave radiation, then infrared radiation, then visible light, then ultraviolet radiation and finally X-rays. While the radiation from radio waves is not dangerous to the human body, extremely low frequency radio waves are perceptible to most people. Electromagnetic radiation damage typically begins further up the electromagnetic spectrum, such as with microwave radiation.Learn more about Optics & Waves
Ultrasonic waves are sound waves transmitted above the human-detectable frequency range, usually above 20,000 Hz. They are used by some animals and in medical or industrial technological devices.Full Answer >
All ultrasonic waves share the common property of being mechanical waves with a frequency higher than the upper limit of the human hearing range. The only difference in physical properties between ultrasonic and sub-ultrasonic waves is that ultrasonic waves cannot be heard by humans while sub-ultrasonic waves can.Full Answer >
The frequency range of ultraviolet waves is between 7.5 x 10^14 and 3 x 10^16 Hertz. For this range, the corresponding ultraviolet light wavelengths are 400 to 10 nanometers. Ultraviolet light waves are below the visible light spectrum.Full Answer >
Radio waves travel at a velocity that is equal to the speed of light traveling in a vacuum, which is 186,282 miles per second. Top speed is only possible in empty space; passing through transparent liquids and solids like crystals cause waves to bend, which slows down their speed.Full Answer >