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Light Unit
Light Unit 24-54 and Extra Review
44
Science
5th Grade
03/28/2011

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Cards

Term
A combination of several different wavelengths of light traveling together is called
Definition
white light.
Term
The band of light waves of different colors in the electromagnetic spectrum that vibrates at frequencies our eyes can detect is the
Definition
visible spectrum.
Term
The ability of light to cause change, such as heating an object, is called
Definition
light energy.
Term
A material that lets most light waves pass through it is
Definition
transparent.
Term
A material that lets some light waves pass through it is
Definition
translucent.
Term
A material that lets no light waves pass through it is
Definition
opaque.
Term
A surface that curves inward or a lens that is thinnest at the center is
Definition
concave.
Term
A surface that bulges outward or a lens that is thickest at the center is
Definition
convex.
Term
The change in direction of waves after they bounce off of a surface is called
Definition
reflection.
Term
The bending of waves as they travel at an angle from one medium to another is
Definition
refraction.
Term
When light hits an opaque object, it
Definition
is either absorbed or reflected.
Term
The color of light is determined by its
Definition
wavelength.
Term
In the visible spectrum, the color of light that has the longest wavelength is
Definition
red.
Term
In the visible spectrum, the color of light that has the shortest wavelength is
Definition
violet.
Term
To remember the colors from longest to shortest in the visible spectrum, you can use the name
Definition
Roy G Biv
Term
What are the colors of the visible spectrum from the longest wavelength to the shortest wavelengh.
Definition
Red, orange, yellow, green, blue, indigo, violet
Term
Clear window glass and transparency film are
Definition
transparent.
Term
Frosted window glass and most window shades are
Definition
translucent.
Term
Optical tools enlarge or make images clearer.  This is possible through the use of
Definition
lenses and mirrors.
Term
An optical tool that can be used to refract white light is called a
Definition
prism.
Term
When the different wavelengths of light in white light pass through this tool, they are bent at different angles so that we can see red, orange, yellow, green, blue, indigo and violet light.  This tool is a
Definition
prism.
Term
True or False - Light does not need a material to travel through.
Definition
True
Term
Light from the sun can travel the 150 million kilometers to Earth in less than
Definition
8 1/2 minutes.
Term
When white light strikes an object, some wavelengths are absorbed and others are reflected.  The color you see is the wavelength of light that is
Definition
reflected.
Term
As light passes through a lens, the light rays are first brought together and then crossed and spread apart.  This causes objects viewed through the lens to appear to be larger than they really are.  they type of lens described here is
Definition
convex.
Term
As light passes through a lens, the light rays are spread apart because the lens is thickest at the edges.  This causes objects viewed through the lens to appear smaller than they really are.  The type of lens described here is
Definition
concave.
Term
As light rays hit a smooth surface, they bounce off at a predictable angle.  When light rays hit an uneven surface, they scatter.  In both of these situations, light is being
Definition
reflected.
Term
When you look at the stem of a flower in a glass of water, the stem appears to be broken.  Since the water and glass are more dense than air, light travels more slowly through the water and glass than it does through the air.  As the light passes from one material to another, the light is
Definition
refracted.
Term
A metal beam and a piece of wood are
Definition
opaque.
Term
Crest
Definition
The highest point of a light wave.
Term
Trough
Definition
The lowest point of a light wave.
Term
Lens
Definition
Piece of glass or plastic with curved surfaces that refracts light; part of the eye that focuses light rays on the retina.
Term
Frequency
Definition
The number of wavelengths that pass through a given point each second.
Term
Image
Definition
Likeness or copy
Term
Luminous
Definition
Giving off its own light.
Term
Illuminated
Definition
Reflecting light that strikes it.
Term
Wave
Definition
Rhythmic pattern that carries energy.
Term
Ray
Definition
Narrow beam of light that travels in a straight line from a light source.
Term
Primary colors of light
Definition
Red, green and lue light.
Term
Which of these objects is translucent?  Notebook, mirror, brick or sunglass lenses.
Definition
Sunglass lenses.
Term
Which of these objects is opaque?  Brick, eyeglass lenses, liquid water, or stained glass windows.
Definition
Brick
Term
Which object helps people understand what makes up white light?  Barometer, Prism, Microscope or Thermometer
Definition
Prism
Term
A shiny aluminum screen can be placed on the windshield of a parked car.  This screen helps to keep the car cook because it
Definition
reflects the sunlight.
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