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