• Light is an _______________
electromagnetic
wave that can travel
through space or matter.
Created by Kris Campesi
• Electromagnetic waves or
transverse
light waves are __________
waves.
• The fastest thing in the
universe is
light
300,000,000 m/s in a vacuum
• “Light” is not just
something you can see.
• The entire range of
electromagnetic waves
(light) is called the
Electromagnetic spectrum
• Longest waves & lowest
frequency of EM waves is
Radio waves
• AM amplitude modulated.
• FM frequency modulated.
• Television uses AM for
sound and FM for picture.
• Shorter wavelengths &
higher frequency and
more energy than radio
wavesmicrowaves
• Shorter wavelength &
higher frequency than
microwaveInfrared waves
• It is called infrared
because it’s wavelengths
are just longer than red
light.
• You feel infrared waves
as heat!
• The very small narrow
range of the EM spectrum
that humans can seeVisible spectrum
• When all the colors are
combined you see white
light.
• Another EM wave
produced by the sun with
more energy than visible
lightUltraviolet light
• Positive-Kills germs,
helps skin cells produce
vitamin D.
• Negative-sunburn, skin
cancer, damage to eyes,
wrinkles & early aging.
• Highest energy, shortest
wavelengthsX-rays & gamma rays
• When light or any other
wave bounces off an object
it is called
reflection
• The law of reflection
states that the angle of
incidence is equal to the
angle of reflection.
• When a wave passes at
an angle from one
medium to another it is
refraction
• The amount of refraction
depends on the
wavelength.
• Rainbows are created
when sunlight is refracted
by water droplets.
• When light strikes matter it
can interact in 3 different
ways:
• The passing of light
through matter is
transmission
• Example:
• Matter through which
visible light is easily
transmitted is said to be
transparent
• Example:
• Matter that transmits light
but also scatters the light
as it passes through is
translucent
• Example:
• Matter that does not
transmit any light is
opaque
• Example:
• The color that an object
appears to be is
determined by the
wavelength of light that
reaches your eye.
• The color of an opaque
object is the color that is
reflected to your eye.
• White is when all colors
are reflected and black is
when all colors are
absorbed.
• What color would a red
ball be in a room with
nothing but blue light?
black
• What color would a white
shirt be in a room with
only red light?
red
• In transparent objects the
color that you see is the
color of light that was
transmitted.
• Primary colors of light are
red
blue
green
• Pigment is a material that
gives a substance its color
by absorbing some colors
of light and reflection
others.
• Primary pigments are
yellow, cyan and magenta.