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| Name the alignment of vibrations in a transverse wave, usually by filtering out waves of other directions. |
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| Light travels in ______________________ waves. |
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| Name the darker part of a shadow where all the light is blocked. |
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| Name a partial shadow that appears where light from part of the source is blocked and light from another part of the source is not blocked. |
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| A thin beam of light is called a __________________. |
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| A shaded region that results when light falls on an object and thus cannot reach into the region on the far side of the object. |
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| If a material absorbs light without reemission they are ___________ |
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| If visible light passes through glass, why does glass get hot in sunlight? |
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Definition
| It absorbs ultraviolet light. |
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Term
| Why is the average speed of light lower in water or glass than in a vacuum? |
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Definition
| There is a time delay in the absorption and reemission of the light by the particles in the medium. |
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| Name the term applied to materials that allow light to pass through them in straight lines. |
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| Light has a speed of 300,000 km/s in a ______________________. |
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| Light speed is lower than 300,000 km/s in ______________________. |
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| Light is energy that travels in _____________________________ waves within a certain range of frequencies |
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| _____________ is produced by vibrating electric charges in atoms. |
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| Light passes through materials whose atoms absorb the energy and immediately ___________ it as light. |
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| Light waves are ____________, so they can be polarized (with vibrations all in the same direction). |
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Term
| The aligning of vibrations in a transverse wave, usually by filtering out waves of other directions is called _________________. |
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| In 1905 Einstein published a theory explaining how light consists of particles that were massless bundles of concentrated electromagnetic energy. This was called the __________________________. |
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| The particle that travels only at the speed of light and whose energy is related to the frequency of the radiation in the wave model is called a__________. |
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Definition
| The distance light travels in one year. |
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| A wave that is partly electric and partly magnetic and carries energy is called an _________________________. |
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| Light is energy that travels in a wave that is partly ____________ and partly ___________________. |
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| The range of electromagnetic waves extending from radio waves to gamma rays is called _________________. |
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| Electromagnetic waves of frequencies ____________ than visible red are called infrared. |
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| Electromagnetic waves of frequencies _____________ than those of violet are called ultraviolet. |
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| Radio waves are low-frequency ___________ waves? |
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