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science finals
test
50
Science
8th Grade
05/15/2007

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Term
amplitude
Definition
the max distance the particles of a medium can move from their rest position
Term
antinode
Definition
the point of max amplitude on a standing wave
Term
compression
Definition
the part of a longitudinal wave where the particles particles of the medium are close together
Term
constructive interfence
Definition
the interference that occurs when wavees combine to make a wave with larger amplitude
Term
crest
Definition
the highest part of a transverse wave
Term
destructive interference
Definition
the interference that occurs when when two wavve combine to make a wave with smaller amplitude
Term
diffraction
Definition
the bending of waves as they move around a barrier or pass though an opening
Term
frequency
Definition
the number of complete waves that pass a point in a certian amount of time
Term
hertz
Definition
unit of measurement for frequency
Term
law of reflection
Definition
the rule that the angle of reflection equals the angle of incidence
Term
longitudinal wave
Definition
the wave that move the meduim parallel to the direction of the wave
Term
mechanical wave
Definition
a wave that requires a medium to travel
Term
medium
Definition
the material though which a wave travels
Term
node
Definition
the point of zero amplitude on a standing wave
Term
rarefaction
Definition
the part of a longitudinal wave where the particles of the medium are far apart
Term
reflection
Definition
the bouncing back of an objecty when it hits a surface though which it can't pass
Term
refraction
Definition
the bending of waves as they enter a new medium at an angle
Term
standing wave
Definition
a wve that appers to be standing ,eventhough it is two wave interferfering as they pass each other
Term
transverse wave
Definition
wave that moves the medium in the direction of perpendicular to that of the wave
Term
trough
Definition
the lowest point of a transverse wave
Term
wave
Definition
a disturbance that transfers energy from one place to another
Term
wavelength
Definition
the distance between teo corrosponding parts of a wave
Term
pitch
Definition
pereception of the frequency of sound
Term
decibel
Definition
unit for sound
Term
doppler effect
Definition
the change in frequency of a wave as its source move in the relation to the observer
Term
ear canal
Definition
collects sound waves and directs them into narrow region of ear
Term
middle ear
Definition
behind the eardrum
Term
inner ear
Definition
third section of ear
Term
cochela
Definition
a fulid filled cavity shaped like a sanil shell
Term
outer ear
Definition
first part of your ear
Term
hammer
Definition
attached to eardrum
Term
eardrum
Definition
small tightly streched ,drumlike membrane
Term
stirup
Definition
membrane that seperates the middle ear from inner ear
Term
anvil
Definition
bone of inner ear
Term
auditroy nerve
Definition
either one of the eighth pair of cranial nerves, consisting of sensory fibers that conduct impulses from the organs of hearing and from the semicircular canals to the brain
Term
semicircular canals
Definition
certain canals in the inner ear
Term
concave lens
Definition
a lens that is thinner in the centerthen at the edges
Term
convex lens
Definition
a lens that is thicker at the center than at the edges
Term
cornea
Definition
transparent surface part of the eye
Term
electromagnetic spectrum
Definition
teh complete rangeof electomagnetic wave placed in order of increasing frequency
Term
electromagnetic wave
Definition
transverse waves that transfer electrical and magnetic energy
Term
iris
Definition
the ring of muscle that controls the size of the pupil and gives the eye its color
Term
lens
Definition
a curved piece of glassor other transparent material that is used to reflect light
Term
opaque
Definition
not clear ,not transmitting or reflecting light
Term
optic nerve
Definition
short,thick nerve taht carries signals fromthe eye to the brain
Term
photon
Definition
a tiny particle or packet of light energy
Term
pigment
Definition
a colored substance used to color other materials
Term
pupil
Definition
the opening in the center of the iris though light enters the insed of the eye
Term
ray
Definition
a staright line used to represnet a light wave
Term
real image
Definition
an upside-down image formed where rays of light meet
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