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science Light Vocab

Vocab for Light Chapter

QuestionAnswer
Electromagnetic waves waves that consist of electric and magnetic fields that vibrate at right angles to each other
Does light have to travel through matter? No
Do sound waves have to travel through matter? Yes
Do water waves have to travel through matter? Yes
How do electromagnetic waves travel? They travel around and change electric and magnetic fields
Radiation transfer of energy as electromagnetic waves
How long does it take light to travel from the sun to Earth? 8.3 minutes
Electromagnetic spectrum All of the frequencies or wavelengths of electromagnetic radiation
Infrared waves Below red
Reflection Bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not go through.
A firefly is an example of a ________. luminous object
Absorption In optics, the transfer of light energy to particles of matter.
Scattering An interaction of light with matter that causes light to change its energy, direction of motion, or both.
Why is the sky blue? Because of the scattering from the lights.
Refraction The bending of a wave as the wave passes between two substances in which the speed of the wave differs
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.
How does white light get separated into a rainbow It goes into the colors of visible light by refraction
Diffraction change in the direction of a wave when the wave finds an obstacle or an edge, such as an opening
Interference Combination of two or more waves that results in a single wave
Transmission Passing of light or other form of energy through matter
Transparent Describes matter that allows light to pass through with little interference
Translucent describes matter that transmits light but that does not transmit an image
Opaque describes an object that is not transparent or translucent
Primary colors of light Red, blue, and green
Why are red, green, and blue primary colors of light they combine to make white light
What does the law of reflection show? That it is equal to the angle of reflection
Incidence The arrival of beam of light at a surface
Created by: lkdedinsky.clm
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