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Introduction to Light
Physical Science - Middle School
❮
1
/
2
❯
photons
Einstein
electrons
Introduction
To
Light
c
(speed
of
light
)
=
300,
000
km/s
electrical
eld
electromagnetic
waves
magnetic
eld
c
=
wavelength
(λ) x frequency (
ν)
Electromagnetic
Waves
What
surrounds
you
and
bombards
you
constantly?
Most
of
it
is
invisible
but
you
can’t
imagine
living
without
it.
It
is
electromagnetic
radiation,
a
type
of
energy
commonly
known
as
light.
This
energy
is
produced
by
the
vibration
of
charged
particles.
2:13
1
2
3
4
5
6
7
8
9
0
1
+
-
-
+
2
3
4
5
6
7
8
9
0
M
2
M
2
C
1
GH
I
PQR
S
As
charged
particles
move
back
and
forth,
the
electric
field
around
them
vibrates,
creating
a
vibrating
magnetic
field.
The
two
vibrating
fields,
which
are
at
right
angles
to
each
other,
produce
electromagnetic
waves.
These
waves
can
travel
through
materials
as
well
as
a
vacuum.
All
electromagnetic
waves
travel
at
the
incredible
speed
of
about
300,000
km/s
in
a
vacuum,
often
called
the
speed
of
light.
This
speed
is
equal
to
the
wavelength
of
light
times
its
frequency
and
is
represented
by
the
equation
c
=
wavelength
x
frequency.
Light:
Wave
or
Particle
Most
of
us
think
of
light
as
a
wave.
Waves
easily
explain
interactions
such
as
reflection.
However,
early
in
the
20th
century,
some
scientists
noticed
that
light
hitting
a
metal
surface
can
sometimes
eject
electrons.
How
can
light
waves
do
this?
Albert
Einstein
showed
this
can
only
happen
if
light
is
made
up
of
tiny
particles
called
photons.
Einstein
revolutionized
physics
by
describing
light
as
photons.
Scientists
now
believe
light
exhibits
both
wave
and
particle
properties.
© Copyright NewPath Learning. All Rights Reserved. 94-4476
Visit
www.newpathlearning.com
for
Online
Learning
Resources.
Introduction
To
Light
Pause
and
Review
Complete
the
graphic
organizer.
© Copyright NewPath Learning. All Rights Reserved. 94-4476
Visit
www.newpathlearning.com
for
Online
Learning
Resources.
Electromagnetic
Waves
produced
by
known
as
made
up
of
explain
the
interaction
travel
at
a
speed
of
represented
by
the
equation
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