Download Sources of light - C. Stewart Classes

SNC 2D Notes: Luminous Sources
A. Where Does Light Energy Come From
Light energy comes from other forms of energy. In luminous objects
some forms of energy can be converted into light energy. The forms of
energy that commonly converted into light energy are chemical energy,
electrical energy, and thermal (heat) energy.
Types of Sources of Light
Light produced by the Sun or other stars are called natural light. Light
produced through human technology is called artificial light.
Natural Sources Of Light
Artificial Source Of Light
Sun
Light Bulb
Stars
Match
Lightning
Lighter
Fire
Flashlight
Volcanoes
Laser
Fireflies
Explosion
Northern Lights
Fire Works
Oil Lamp
Computer Screen
Sources of light
1. Objects that emit light are said to be
2. Sunlight is the most
.
source of
light.
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3.
is when light is produced from a chemical reaction
without a rise in temperature. An example of this is a glow stick.
4. Bioluminescence light is produced by
.
within the cells of organisms produces light. Some common
examples are
and
.
5. Bioluminescence is a form of
.
6. Incandescent light is light that is produced by an object that is
extremely
. Incandescent light bulbs are only _______
efficient in producing light. The remaining energy is lost as
.
7. On the other hand, fluorescent light is produced when an object has
absorbed invisible
radiation. Fluorescent light sources sources are
efficient and last longer than incandescent light sources.
8. Luminescence describes a light source that is able to generate light
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without heating the object.
is a form of
luminescence. Fluorescent light is light emitted by a substance when
they are exposed to electromagnetic radiation.
is also
another form of luminescence. Phosphorescent materials get their
source of energy from
9. Producing light from friction is called
be made to glow by just
light.
. Some crystals can
them together or
crushing them.
10. An electric discharge is a method for producing light in which a
passes through the air or another gas such as neon.
11. Similar to water, light travels like a wave. This wave is called an
wave.
12. The speed of light is
m/s.
13. The colour of light is determined by the different
. Red has the
wavelength while
has the shortest.
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14. __________________________ objects cannot produce their own light.
They may appear bright by reflecting light from a luminous object. The
is an example of a non-luminous light source.
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