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Study Guide Answers

1.     Light is a(n) _______________________ form of energy.
     pure
2.     The _____________________________________ spectrum contains many kinds of electromagnetic waves.
     electromagnetic
3.     What produces electromagnetic waves?
     the motion of electrically charged particles
4.     What are the components of the electromagnetic spectrum?
     radio waves/ infrared waves/ visible light/ ultraviolet waves/ x-rays/ gamma rays
5.     Which component(s) of the electromagnetic spectrum can be seen by the human eye?
     visible light
6.     With what is each wavelength of visible light associated?
     a particular color
7.     What is created when all of the colors that are found in visible light combine?
     white light
8.     What is "color"?
     Color is the light that's reflected back to our eyes by objects.
9.     Objects have no color of their own. True or false?
     true
10.     What colors are found in visible light?
     red/ orange/ yellow/ green/ blue/ indigo/ violet
11.     What acronym can help us to remember the colors that are present in visible light?
     ROY G. BIV
12.     What are the four properties of light?
     reflection/ diffraction/ interference/ refraction
13.     _______________________________ occurs when light strikes an object's surface and bounces off that surface.
     Reflection
14.     The "angle of incidence" is equal to the "_________________________________________."
     angle of reflection
15.     ______________________________ occurs when light waves bend around the edges of objects.
     Diffraction
16.     When two or more waves are in the same space at the same time, _____________________ occurs.
     interference
17.     When a light wave bends as it moves from one medium to another, ___________________ occurs.
     refraction
18.     A three-sided transparent lens that refracts white light is a(n) ________________________.
     prism
19.     Rainbows are created when __________________________________________________.
     raindrops in the air refract the colors of visible light
20.     Transparent materials ________________________________ light.
     transmit
21.     Translucent materials allow no light to pass through them. True or false?
     false
22.     __________________________________ materials absorb or reflect all light.
     opaque
23.     Objects ________________________ some colors of the spectrum and absorb others.
     reflect
24.     White objects __________________________________ all colors.
     reflect
25.     Black objects _________________________________ all colors
     absorb
26.     Why is the sky blue?
     Gas particles in the Earth's atmosphere cause violet and blue wavelengths of light to be reflected.
27.     How many colors can the human eye perceive?
     more than a million
28.     What controls how much light enters your eye?
     the iris
29.     What two light-sensitive nerve cells are in the retina?
     rods and cones
30.     Cones in the eye respond to ___________________________.
     color
31.     Rods in the eye are sensitive to _________________________________.
     light
32.     What are the primary colors of light?
     red/ blue/ green
33.     When red light and green light are mixed, what color of light is produced?
     yellow light
34.     What are the primary colors of pigment?
     magenta/ yellow/ cyan
35.     Mixing primary colors of pigment results in ______________________________________.
     color subtraction
36.     Fluorescent light is "full spectrum " light. True or false?
     false
37.     The filament of an incandescent light bulb is usually made of _________________________.
     tungsten
38.     Fluorescent light bulbs are filled with _________________________.
     gas (argon)
39.     "Laser" stands for "_________________________________________________________."
     light amplification by stimulated emission of radiation
40.     What are some fields in which lasers are used?
      medicine/ business/ entertainment
© Educational Video Network, Inc. 2005 - www.evndirect.com
Your leading source for curriculum-based educational videos and DVDs.