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GHS - PSCP - 18
Vocabulary for EM waves
| Term | Definition |
|---|---|
| electromagnetic waves | transverse waves of electric and magnetic fields |
| electric field | an area that exerts force on charged particles |
| magnetic field | an area that exerts magnetic forces |
| electromagnetic radiation | energy transfer through matter or empty space |
| photoelectric effect | release of electrons from metal struck by light |
| photons | a packet of electromagnetic energy |
| intensity | the rate of energy over an area |
| electromagnetic spectrum | all types of electromagnetic radiation |
| amplitude modulation | sends information by changing amplitude |
| frequency modulation | sends information by changing frequency |
| thermogram | an image made with infrared radiation |
| radio waves | used to transmit sound and images |
| infrared waves | used as a source of heat |
| visible light | part of the spectrum humans can see |
| ultraviolet waves | used for sterilization and vitamin D production |
| x-rays | used for medical imaging of bones and teeth |
| gamma rays | used for radiation therapy |
| transparent | transmits light as it passes through |
| translucent | scatters light as it passes through |
| opaque | absorbs or reflects light |
| transmissivity | how light interacts with matter |
| image | a copy an object formed with light |
| regular reflection | light is all reflected in the same direction |
| diffuse reflection | light is reflected in different directions |
| refraction | light bends as it changes speed |
| mirage | a false or distorted image due to refraction |
| polarization | light vibrating in the same direction |
| scattering | redirection of light as it passes through a medium |
| dispersion | separation of white light into a spectrum |
| color | determined by the light that reaches your eyes |
| primary colors | colors that can be mixed to form all other colors |
| secondary colors | the mixture of two primary colors |
| complementary colors | one primary and one secondary color made of the other two primary colors |
| pigment | a material that absorbs and reflects different colors |
| complementary light colors | two colors that make white |
| complementary pigment colors | two colors that make black |
| luminous | makes its own light |
| incandescent | light made because of temperature |
| fluorescence | absorbs one wavelength and releases another |
| fluorescent light | light made by phosphors |
| phosphor | solid material that can fluoresce |
| LASER | light that is coherent |
| coherent | light that has all waves lined up and is the same wavelength |
| neon | light made by excited gas atoms |
| sodium-vapor light | light made by metal vapor at high energy levels |
| tungsten-halogen light | light made by extremely hot metal filament in a quartz tube |
| cornea | clear, protective covering on the eye |
| iris | colored ring of muscles in the eye |
| pupil | changes size to let light in the eye |
| retina | layer of nerve cells sensitive to light |
| rods | cells in the retina sensitive to black, white, and gray |
| cones | cells in the retina sensitive to red, green, and blue |
| nearsightedness | distant objects appear blurry |
| farsightedness | nearby objects appear blurry |
| astigmatism | objects appear blurry due to misshapen eye |
| color-blindness | inability to see certain colors |
Created by:
dbertelsen
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