Vocab for Light Chapter
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Electromagnetic waves | waves that consist of electric and magnetic fields that vibrate at right angles to each other
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| Does light have to travel through matter? | No
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| Do sound waves have to travel through matter? | Yes
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| Do water waves have to travel through matter? | Yes
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| How do electromagnetic waves travel? | They travel around and change electric and magnetic fields
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| Radiation | transfer of energy as electromagnetic waves
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| How long does it take light to travel from the sun to Earth? | 8.3 minutes
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| Electromagnetic spectrum | All of the frequencies or wavelengths of electromagnetic radiation
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| Infrared waves | Below red
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| Reflection | Bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not go through.
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| A firefly is an example of a ________. | luminous object
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| Absorption | In optics, the transfer of light energy to particles of matter.
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| Scattering | An interaction of light with matter that causes light to change its energy, direction of motion, or both.
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| Why is the sky blue? | Because of the scattering from the lights.
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| Refraction | The bending of a wave as the wave passes between two substances in which the speed of the wave differs
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| On page 78, why does the cat see the fish up close and the fish see the cat far away? | Because the fish is in the water. Since the cat is looking into the water, the fish looks closer to him.
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| How does white light get separated into a rainbow | It goes into the colors of visible light by refraction
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| Diffraction | change in the direction of a wave when the wave finds an obstacle or an edge, such as an opening
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| Interference | Combination of two or more waves that results in a single wave
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| Transmission | Passing of light or other form of energy through matter
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| Transparent | Describes matter that allows light to pass through with little interference
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| Translucent | describes matter that transmits light but that does not transmit an image
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| Opaque | describes an object that is not transparent or translucent
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| Primary colors of light | Red, blue, and green
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| Why are red, green, and blue primary colors of light | they combine to make white light
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| What does the law of reflection show? | That it is equal to the angle of reflection
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| Incidence | The arrival of beam of light at a surface
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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.
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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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