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6th Grade Ch 4
Sound and Light
| Term | Definition |
|---|---|
| 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
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