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20 Cards in this Set

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Electromagnetic Spectrum
The entire range of electromagnetic radiation - all of its wavelengths, including those of visible light.
Electromagnetic Radiation
Traverse waves that transfer energy by radiation; vary in length from very long radio waves to extremely short gamma waves.
Radiation (radiant energy)
The transfer of energy in the form of waves. Radiation is a type of energy transfer that does not require matter.
Magnetic Field
Region around a magnet where magnetic forces act.
Electric Field
An area surrounding an electron that exerts a force on anything nearby with an electric charge; the strongest nearest the electron and weakens with distance.
The Speed of Light
The distance light can travel in a unit of time through a given substance. Light travels through a vacuum at 186,000 Miles or 300,000 Km per sec.
Radio Waves
Electromagnetic waves that have long wavelengths (low frequencies); radio waves are used in communications.
Microwaves
Radio waves with the highest frequency and energy; used in communications and microwave ovens.
Radar
Acronym: RAdio Detection And Ranging.
An electronic instrument that uses radio waves to find the distance and location of other objects.
Infrared Radiation
Electromagnetic waves that have a wavelength slightly longer than visible light; indicates the presence of heat.
Visible Radiation
Electromagnetic waves in the only part of the electromagnetic spectrum we can see -- light.
Ultraviolet Radiation
Electromagnetic waves that have a higher frequency than visible light; abbreviated UV.
X-rays
Electromagnetic waves having a wavelength shorter (higher frequency) than ultraviolet radiation; often used in medicine because it can penetrate tissue.
Gamma Rays
High-frequency electromagnetic waves that travel at the speed of light, have no mass or charge, and are the most penetrating form of radiation.
Satellite
An earth-orbiting device used for receiving and transmitting signals. receives the signals and bounce it back to earth.
Telecommunications
The exchange of information over a distance via any cable, wire, radio, optical, or other electromagnetic systems
Carrier Wave
The wave that transports the signal wave. The carrier is modulated or altered by the signal wave.
Global Positioning System (GPS)
A satellite-based navigational system allowing the determination of a unique point on the earth's surface with a high degree of accuracy.
Amplitude-Modulated (AM) Waves
Radio waves whose amplitude is varied with voice, music, video, or data for transmission over long distances.
Frequency-Modulated (FM) Waves
Radio waves whose frequency is varied with voice, music, video, or data for transmission over long distances.