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Chpt 22 - EM Spectrum
Vocab for em spectrum in Science
26
Science
7th Grade
02/06/2012

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Term
Carrier Wave
Definition
Particular transmission frequency assigned to a radio station.
Term
Concave Lens
Definition
Lens that is thicker at its edges than in the middle and causes light rays traveling parallel to the optical axis to diverge.
Term
Convex Lens
Definition
Lens that is thicker in the middle than at its edges and causes light rays to converge (focus).
Term
Crest
Definition
Highest point on a wave.
Term
Diffraction
Definition
Bending of waves around a barrier.
Term
Electromagnetic Spectrum
Definition
Range of electromagnetic waves with different frequencies and wavelengths.
Term
Electrons
Definition
Negatively-charged particles that move around the nucleus of an atom.
Term
Gamma Ray
Definition
Highest-frequency, most penetrating electromagnetic wave.
Term
Global Positioning System (GPS)
Definition
Uses satellites, ground-based stations, and portable units with receivers to locate objects on Earth.
Term
Infrared Wave (IR)
Definition
Electromagnetic wave that is sensed as heat and is emitted by almost every object.
Term
Interference
Definition
Ability of two or more waves to combine and form a new wave when they overlap.
Term
Lens
Definition
Transparent object that has at least one curved surface that causes light to bend.
Term
Light Ray
Definition
Narrow beam of light traveling in a straight line.
Term
Mechanical Wave
Definition
A type of wave that uses matter to transfer energy.
Term
Proton
Definition
Positively-charged particle that is located in the nucleus of an atom.
Term
Radiant Energy
Definition
Energy carried by an electromagnetic wave.
Term
Radio Waves
Definition
Lowest-frequency electromagnetic waves that carry the least amount of energy and are used in most forms of telecommunication technology - such as TVs, telephones and radios.
Term
Reflection
Definition
Occurs when a wave strikes an object or surface and bounces off.
Term
Refraction
Definition
Bending of a wave as it moves from one medium into another medium.
Term
Transverse Wave
Definition
A type of mechanical wave in which the wave energy causes matter in the medium to move up and down or back and forth at right angles to the direction the wave travels.
Term
Trough
Definition
Lowest point of a wave.
Term
Ultraviolet Radiation (UV)
Definition
Electromagnetic waves with higher frequencies and shorter wavelengths than visible light.
Term
Visible Light
Definition
Electromagnetic waves with wavelengths between 0.7 and 0.4 millionths of a meter that can be seen with your eyes.
Term
Wave
Definition
Rhythmic movement that carries energy through matter or space.
Term
Wavelength
Definition
In transverse waves, the distance between the tops of two adjacent crests or the bottoms of two adjacent troughs; in compressional waves, the distance from the centers of adjacent rarefactions.
Term
X-Rays
Definition
High-energy electromagnetic waves that are highly penetrating.
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