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Waves
Vocabulary
13
Science
8th Grade
07/05/2007

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Term
Transverse wave
Definition
A type of wave where the material it passes through moves sideways compared to the direction of the wave.
Term
Longitudinal wave
Definition
A type of wave where the material it is passing through moves in the same direction as the wave.
Sometimes called compressional wave.
Term
Crest
Definition
The top of a wave.
Term
Trough
Definition
The lowest point in a wave between crests.
Term
Amplitude
Definition
The maximum height of a wave crest or depth of a trough.
Term
Mechanical wave
Definition
A wave which needs a medium in order to propagate itself.
Term
Electromagnetic wave
Definition
Transverse wave that can travel through matter or space and are produced by the motion of electrically charged particles; include X rays, ultraviolet waves, and visible light.
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
Frequency
Definition
Number of wavelengths that pass a given point in 1 s, measured in hertz (Hz).
Term
Interference
Definition
Ability of two or more waves to combine and form a new wave when they overlap.
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
Defraction
Definition
Bending of waves around a barrier.
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