## Waves

##### Created by:

jharding  on May 11, 2008

##### Description:

Vocabulary for waves unit.

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# Waves

 transverse waveA wave in which the vibration is at right angles to the direction in which the wave is traveling.
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#### Definitions

transverse wave A wave in which the vibration is at right angles to the direction in which the wave is traveling.
longitudinal wave (compressional) A wave in which the vibration is in the same direction as that in which the wave is traveling
rest line the line from which the vibration is measured; matter at rest
vibration a repeated back and forth motion that creates a wave
compression when the particles are squeezed together
wave a travelling disturbance that moves energy, not matter
crest the highest point of wave.
trough the lowest point of a wave
amplitude the distance from the rest position to the crest or trough
frequency number of cycles or vibrations per unit time
mechanical wave a wave that requires a medium through which to travel
medium matter (solid, liquid, gas) through which a wave travels
hertz the unit of frequency equal to cycle per second; Hz
seismic wave A vibration that travels through Earth carrying the energy released during an earthquake
absorb to take in
transmit to send on, pass along, send out
diffract to break up into segments or portions
trough lowest point of the wave
reflect bouncing of a wave or ray off a surface, changing its direction
constructive interference Addition of two waves when the crest of one overlaps the crest of another, so that their individual effects add together. The result is a wave of increased amplitude.
destructive interference Addition of two waves when the crest of one overlaps the trough of another, so that their individual effects cancel each other. The result is a wave of decreased amplitude.
rarefaction a part in a longitudinal wave where the particles are spread apart

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