balzer 4th grade ch 14 key vocab
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25 terms
Terms | Definitions |
|---|---|
 What occurs to make a sound? | vibration |
| the part of a wave where the particles are bunched together? | compression |
| a wave that moves or vibrates up and down? | transverse |
| a wave that moves from left to right, then the particles also vibrate from right to left? | longitudinal |
| the kind of matter something travels through? | medium |
| the reflection of sound? | echo |
| how strong a sound seems to a person? | loudness |
| what makes a sound seem high or low? | pitch |
| a snail shaped organ that is filled with a liquid and has tiny hairs? | cochlea |
| light that is the result of chemical reactions inside an animal? | bioluminescence |
| the forms of all light energy? | electromagneic radiation |
| the longest waveleangth and the lowest frequency in visable | red |
| the shortest wavelength and the highest frequency in visable | violet |
| the spectrum that is not able to be seen? | electromagnetic |
| when light rays bounce or reflect, from a surface back to our eyes? | reflection |
| when an object takes in the light wave and they will not bounce back to our eyes? | absorption |
| materials that let light rays pass through them? | transparent |
| materials that let some light rays pass through them but scatter others? | translucent |
| materials that will not let any light pass through? | opaque |
| to bend light? | refraction |
| the dark opening in the center of the iris? | pupil |
| the colored doughnut shaped muscle of the eye? | iris |
| a lens that is thicker at the center than at the edges? | convex |
| a lens that is thinner in the middle then at the edges? | concave |
| a narrow but powerful beam of light? | laser |
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