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100
What is the first basic property of light?
Light is a form of energy 
100
What is the second basic property of light?
Light travels in a straight line
100
What type of light source are the stars and the sun an example of?
Natural light source
100
a lightbulb, glow sticks, matches, glow in the dark stickers, are all examples of ___ _____ _____. 
artificial light sources
100
What is a form of energy that we can see?
Light 
200
Fireworks are an example of which type of light source?
Chemiluminescent light source
200
A firefly is an example of which type of light source?
bioluminescent light source 
200
Glow in the dark stickers are an example of which type of light source?
Phosphorescent light source
200
The type of light we use in this classroom, is a ______ light source.
Fluorescent
200
a light bulb is an example of which type of light source?
Incandescent light source
300
Energy, such as light, that travels by radiation is often called ____________. 
radiant energy 
300
Absorption of sunlight by a black sweater causes the garment to gain ____ _______. 
Thermal Energy 
300
When the tip of the match reacts to produce heat and light, that is called ______ _______. 
Chemical energy 
300
When a substance allows some light to pass through, but the light is scattered from its straight path, that substance must be ______.
Translucent 
300
When you can look through a surface and see the light source clearly on the other side, the surface must be ____. 
Transparent
400
As we move away from a light source, what happens to the intensity of light?
It decreases/lessens 
400
If a material blocks the path of light and does not allow light to pass through, it must be _____. 
Opaque 
400
Something so hot that it glows or emits visible light is which type of light source ______. 
Incandescent 
400
The glow from a black light is called ______.
Fluorescence 
400
The type of light that is produced in living creatures is called __________. 
bioluminescence
500
Energy transfer that does not require matter, is called _____. 
radiation 
500
How does a fluorescent light source work?

invisible ultraviolet light is absorbed by phosphor coating, which causes it to glow

500

The emission of visible light by a hot object is called ____. 

Incandescence
500
What is the difference between a fluorescent source and a phosphorescent source?
Particles in the fluorescent source release their light immediately
500
The persistent emission of light following exposure to and removal of a source of radiation is known as _________.
phosphorescence