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Umit 3 Light and Optical systems Topic 1 What is Light?
N/A
22
Science
8th Grade
11/02/2009

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Term
light
Definition
a form of energy you can see
Term
natural light source
Definition
a light source made by or from nature
Term
radiates
Definition
light spreads out from a certain object such as the sun
Term
radiation
Definition
an energy transfer that does not require matter
Term
radiant energy
Definition
light that has traveled via radiation
Term
artificial light source
Definition
an artificially made light source
Term
incadescent source of light
Definition
a light source made by an object heated to such a high temperature that it radiates light
Term
incandescence
Definition
the emission of visible light by a heated object
Term
fluorescence
Definition
the process where an object absorbs high energy ultra violet light and then emits some of it as light
Term
phosphorescence
Definition
the persistent emission of light following exposure and removal of a source of radiation
Term
chemiluminescence
Definition
the emission of light from a chemical action and not involving heat
Term
bioluminescence
Definition
the emission of light produced by chemical reactions inside the bodies of living creatures
Term
luminous
Definition
giving off its own light
Term
non-luminous
Definition
a substance that does not give off its own light
Term
kilowatt hour
Definition
a unit of electrical energy, the amount of energy transmitted by one thousand watts of power in an hour
Term
ray model of light
Definition
a model based on the observation that light travels in a straight line
Term
ray model
Definition
a model of light based on the observation that light travels in a straight line
Term
ray
Definition
a single line or narrow beam of light that originates from a light source and that may bounce off a surface it strikes
Term
ray diagram
Definition
a representation of the path of light by using a straight line with an arrow
Term
transparent
Definition
allowing light to pass through
Term
translucent
Definition
allows some light to pass through. the light, however, is scattered from a striaght line.
Term
opaque
Definition
not allowing any light to pass through
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