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6th Grade Ch 4

Sound and Light

TermDefinition
sound wave a longitudinal wave that can travel only through matter
pitch the perception of how high or low a sound is; related to the frequency of a sound wave
echo a reflected sound wave
light source something that emits light
light ray represents a narrow beam of light that travels in a straight line
transparent a material that allows almost all of the light striking it to pass through, and through which objects can clearly be seen
translucent a material that allows most of the light that strikes it to pass through, but through which objects appear blurry
opaque a material through which light does not pass
mirror any reflecting surface that forms an image by regular reflection
lens a transparent object with at least one curved side that causes light to change direction
cornea a convex lens made of transparent tissue located on the outside of the eye
iris the colored part of the eye
pupil an opening into the interior of the eye at the center of the iris
retina an area at the back of the eye that contains light-sensitive cells--rod cells and cone cells
Created by: lrlong7