"Radio waves are a type of electromagnetic radiation with the longest wavelengths in the electromagnetic spectrum."
Electromagnetic radiation with the longest wavelengths. It has low penetrating ability and is used for communication and broadcasting.
Electromagnetic Spectrum: A range of different frequencies of electromagnetic radiation, including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
Maxwell's Equations: A set of equations that describes how electric and magnetic fields interact with each other and how they propagate through space.
Wave Propagation: The way in which waves spread out as they travel through a medium or through space.
Antennas: Devices that are designed to emit or receive radio waves or other types of electromagnetic radiation.
Radio Receivers: Devices used to capture radio waves and convert them into useful signals.
Radio Transmitters: Devices used to convert electrical signals into radio waves for transmission.
Amplitude Modulation (AM): A method of encoding information onto a carrier wave by varying its amplitude.
Frequency Modulation (FM): A method of encoding information onto a carrier wave by varying its frequency.
Propagation Modes: Different ways in which radio waves can propagate through space, such as ground wave, sky wave, and space wave.
Radio Interference: Any unwanted signal that interferes with a desired radio signal.
Radio Astronomy: A branch of astronomy that uses radio waves to study celestial objects and phenomena.
Radioactivity: The spontaneous decay of atoms in which radiation is emitted.
Half-Life: The time it takes for half of a quantity of a radioactive substance to decay.
Ionizing Radiation: Radiation that has enough energy to ionize atoms and molecules.
Radioisotopes: Isotopes of an element that are radioactive and can be used in various applications, such as medical imaging and cancer treatment.
Nuclear Energy: The energy released from the fission or fusion of atomic nuclei.
Radiation Protection: Measures taken to protect people and the environment from the harmful effects of radiation.
Radiobiology: The study of the effects of radiation on living organisms.
Radiation Dose: A measure of the amount of radiation absorbed by a person or object.
Radiopharmaceuticals: Radioactive compounds used in medical imaging and therapy.
Radio Waves: These are the longest waves in the electromagnetic spectrum, ranging in frequency from 3kHz to 3GHz. They are used for communication, including radio and TV broadcasting, cell phone communication, and satellite communication.
Microwaves: These waves range in frequency from 300MHz to 300GHz. They are used for communication (satellite, microwave, and radar), heating (microwave ovens), and imaging (MRI).
Infrared Waves: These waves range in frequency from 300GHz to 400THz. They are used for heating (infrared heaters), fiber optic communication, and remote temperature sensing.
Visible Light Waves: These are the only part of the electromagnetic spectrum that can be seen by the human eye, ranging in frequency from 400THz to 800THz. They are used for illumination, photography, and communication (fiber optic).
Ultraviolet Waves: These waves range in frequency from 800THz to 30PHz. They are used for sterilizing (UV lamps), tanning, and detecting counterfeit money.
X-rays: These waves range in frequency from 30PHz to 300EHz. They are used for medical imaging and therapy and airport security scanning.
Gamma Rays: These are the highest frequency waves in the electromagnetic spectrum, ranging in frequency from 300EHz to 3000EHz. They are used for medical imaging and cancer therapy, as well as in nuclear power and weapons.
"Typically with frequencies of 300 gigahertz (GHz) and below."
"Wavelength of a radio wave is inversely proportional to its frequency because its velocity is constant."
"Like all electromagnetic waves, radio waves in a vacuum travel at the speed of light."
"Naturally occurring radio waves are emitted by lightning and astronomical objects."
"Radio waves are generated artificially by an electronic device called a transmitter, which is connected to an antenna that radiates the waves."
"They are received by another antenna connected to a radio receiver, which processes the received signal."
"Radio waves are very widely used in modern technology for fixed and mobile radio communication, broadcasting, radar and radio navigation systems, communications satellites, wireless computer networks, and many other applications."
"Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves can diffract around obstacles like mountains and follow the contour of the earth (ground waves), shorter waves can reflect off the ionosphere and return to earth beyond the horizon (skywaves), while much shorter wavelengths bend or diffract very little and travel on a line of sight."
"To prevent interference between different users, the artificial generation and use of radio waves is strictly regulated by law, coordinated by an international body called the International Telecommunication Union (ITU)."
"The International Telecommunication Union (ITU) defines radio waves as 'electromagnetic waves of frequencies arbitrarily lower than 3,000 GHz, propagated in space without artificial guide'."
"The radio spectrum is divided into a number of radio bands on the basis of frequency, allocated to different uses."
"In the Earth's atmosphere, radio waves travel at a slightly slower speed than in a vacuum."
"Naturally occurring radio waves are emitted by lightning and astronomical objects."
"Much shorter wavelengths bend or diffract very little and travel on a line of sight, so their propagation distances are limited to the visual horizon."
"Radio waves are used in modern technology for fixed and mobile radio communication, broadcasting, radar and radio navigation systems, communications satellites, wireless computer networks, and many other applications."
"Long waves can diffract around obstacles like mountains and follow the contour of the earth (ground waves)."
"Shorter waves can reflect off the ionosphere and return to earth beyond the horizon (skywaves)."
"At 30 Hz the corresponding wavelength is ~10,000 kilometers (6,200 miles), which is longer than the radius of the Earth."
"At 300 GHz, the corresponding wavelength is 1mm, which is shorter than the diameter of a grain of rice."