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Waves
waves
27
Science
9th Grade
04/10/2007

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Term
waves
Definition
a rhythmic disturbance which transfers energy through matter or space
Term
medium
Definition
the matter of material through which a waves energy is transmitted.
Term
____ is the medium for sound waves
Definition
air
Term
______ is the medium for water waves
Definition
water
Term
a medium transfers energy, but has no overall _____ itself.
Definition
motion
Term
density
Definition
the more dense the medium, the faster the wave travels
Term
elasticity
Definition
the ability of a medium to quickly return to its original shape after being disturbed
Term
transverse waves
Definition
a wave in which the motion of the medium is at right angles (perpindicular) to the direction of the wave.
Term
crest
Definition
highest point on the transverse wave
Term
trough
Definition
lowest point on a transverse wave
Term
amplitude
Definition
the distance above or below the resting position of the wave
Term
longitudinal (conpressional) waves
Definition
waves in which the motion of the medium is parallel to the direction of the wave
Term
compression
Definition
a space in the medium where molecules are conpact or very close together
Term
rarefraction
Definition
a space in the medium where molecules are spread out and fewer in number
Term
waves length
Definition
the distance from one compression the next compression or from one rarefraction to the next rarefraction to the next rarefraction
Term
frequency
Definition
the number of waves which pass a given point, sound, or number of vibrations each second (for sound waves the higher the frequency the higher the pitch)
Term
speed(velocity)
Definition
the speed of a wave will depend upon the type of medium through which it travels
Term
period
Definition
the time required for one full wave length to pass a certain point
Term
doppler effect
Definition
change in frequency (pitch) caused by the motion of the source or observer
Term
reflection
Definition
the bouncing back of waves as they strike a barrier which doesnt absorb all the energy of the wave
Term
longitudinal
Definition
echoes are ______ waves being reflected
Term
transverse
Definition
an image in a mirror is produced by _______ waves
Term
diffraction
Definition
the bending of waves around the edge of a barrier; producing a new series of waves that spread out
Term
refraction
Definition
the bending of waves due to a change in speed as it moves from one medium to another
Term
interference
Definition
the crossing of wave patterns producing a loss of energy in certain areas and a reinforcing of energy in other areas
Term
constructive interfrence
Definition
(combine by adding) waves are in phase (crest to crest, trough to trough) producing a loss in energy causeing a decrease in amplitude
Term
destructive interference
Definition
(combine by subtracting) waves are out of phase producing a loss in energy causing a decrease in amplitude
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