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LIGHTING THE WAY
Section Vocabulary
• Energy- the ability to do work or cause a
change in matter
• Electromagnetic radiation- energy in the form
of waves coming from excited electric
changes.
• Visible Light- type of electromagnetic
radiation that we can see
The Sun
• The Sun’s rays provide the Earth with light
and heat which are both forms of energy.
• The Sun, a star, generates most of the Earth’s
natural light.
• Even moonlight is just the moon’s reflection
of the Sun’s rays.
The Sun
• The Sun gives off huge amounts of energy
that travels to Earth through the vacuum of
space. This energy is called electromagnetic
radiation.
• There are many kinds of electromagnetic
radiation; some you can see and some you
can not.
Types of Light
Visible
• Visible light is the type of
E.M. radiation that we can
see.
• An example is the light we
Visible light
is the type of E.M.
see!!!
Duh……
radiation that we can see.
Example is the light we see!!! Duh……
Non-Visible
• Most types of E.M. are
invisible.
• Some examples are
infrared and ultraviolet
radiation
Infrared Radiation
• Infrared radiation from the sun causes you to
feel warm when you stand in sunlight.
• Infrared lamps produce heat for personal and
industrial use.
Now that feels better than
saving money!
Ultraviolet
• Ultraviolet light is sometimes also called
backlight.
• It appears dark to us but when this light
shines on some materials, they glow and give
off visible light.
Changes in States of Matter
• Electromagnetic radiation can cause changes
in matter.
• Sunlight warms the ocean’s waters.
• Sunlight is transformed into energy when
partnered up with solar calculators.
• It even starts one of the most important
chemical reactions on Earth, photosynthesis.
Light Bulbs
• Light bulbs are the most common source of
artificial light. However, fire was the first light
we were able to control.
• Fire is a rapid chemical reaction that gives off
light.
• Two important results of burning matter is
light and heat.
Chemical Reaction
• Most chemical reactions give off light and
produce heat.
• Thing about the Science Mind Molder…..
• The battery gave off an electrical charge due
to the chemical reaction taken place inside of
it. That electrical charge runs through the
light bulb creating light and heat energy!
Incandescent
• Most commonly used
• A very thin wire, called a filament, caries
electricity
• The wire gets very hot when electricity
flows through it making the wire glow
• Very inefficient!!!!!!
Fluorescent
• These bulbs contain a gas that gives off
ultraviolet radiation when electricity
passes through.
• Remember!! You can not see UV light.
The inside of the bulb is coated with
chemicals that glow when UV light strikes
it.
• These bulbs are very efficient