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23 Cards in this Set
- Front
- Back
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Electromagnetic Waves |
originates from the accelerated motion of electrons light is the only thing we see |
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Electromagnetic Waves |
made up of of vibrating electric and magnetic fields |
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Source of light Reflectors |
anything that gives off light is a _______________. Most things in the world are ______________. |
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Electromagnetic Spectrum |
classification of waves according to frequency no sharp boundaries between regions |
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Red Violet Ultraviolet X-ray and Gamma Ray |
lowest frequency of light we can see appears? highest frequency of light we can see appears? Higher frequency of light? more energetic+causes sunburn What is beyond that? |
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Continuum |
no break in the system |
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Transparent materials |
light is transmitted similarly to sound. Both are vibrations due to a vibrating source. |
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visible light; UV & infrared light Vibration |
Glass is transparent to ________ _______, but not to ________ & __________ __________. Electrons or molecules in the glass are forced into ____________. |
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visible light atom vibrate temperature |
Infrared waves with frequencies lower than those of ______ _______ cause not only the electrons, but the entire ________ to ________, increasing the __________ of the structure. |
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Opaque |
Most things are _________- they absorb light without re-emtting it. Ex: Books, desks, chairs, people |
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Random Kinetic Energy (Internal Energy) |
vibrations given by light to they atoms and molecules are turned into _____________ |
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Vacuum- C (300,000,000 m/s) Atmosphere- slightly less than c (rounded off to c) Water- .75 C Diamond- .41 C Glass- .67 C, depending on material |
Average speed of light through different materials Vacuum Atmosphere Water Diamond Glass |
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Electrons Vibrations Reflection |
Light shining on metal forces free _________ in the metal into __________ that emit their own light as ___________ |
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Ray |
a thin beam of light |
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Somewhat blurry |
a large, nearby light source produces a __________________ shadow |
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Fuller |
Either a large, far away light or a small close light will give a _________________ shadow |
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Umbra |
a total shadow
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Penumbra |
a partial shadow |
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Retina |
composed of tiny antennae that resonated to the incoming light |
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Rods |
________ handle vision in low light |
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Cones |
_________ handle color vision and detail. |
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Red, green, and blue |
There are three types of cones stimulated by low, intermediate and high frequencies |
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Sensitive |
Although our vision is poor from the corner of the eye, we are _________ |
