chapter 27 vocabulary
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| in the particle model of electromagnetic radiation,a particle that only travels at the speed of light and whose energy is related to the frequency of the radiation in the wave model | Photon
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| the distance light travels through a vacuum in one year | Light Year
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| a wave that is partly electric and partly magnetic and carries energy. Emitted by vibrating electric charges | Electromagnetic Wave
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| the range of electromagnetic waves extending from radio wave to gamma-rays. | Electromagnetic Spectrum
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| electromagnetic waves of frequencies lower than the red end of visible light | Infrared
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| electromagnetic waves of frequencies higher than those the violet end of visible light | Ultraviolet
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| term applied to materials that allow light to pass through in straight lines. | Transparent
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| term applied to materials that absorb light without reemission and consequently do not allow light to pass through | Opaque
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| a thin beam of light | Ray
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| a shaded region that light that results when light falls on an object and thus cannot reach into the region on the far side of the object | Shadow
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| the darker part of the shadow where all the light is blocked | Umbra
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| partial shadow that appears where light from part of the source is blocked and light from another part of the source is not blocked. | Penumbra
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| the aligning of vibrations in a transverse wave, usually by filtering out waves of other directions. | Polarization
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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