The
is the
term use for all the wavelengths of
light.
It includes:
1. radio wave
5. ultraviolet light
2. microwave
6. X-rays
3. Infrared
7. Gamma rays
4. visible light
Light waves are made of electric and
magnetic fields that transfer energy as
they travel through space.
Some of the light has a lot of energy
and has short wavelengths.
Some of these waves are shorter than
the diameter of an atom.
Other light has less energy and longer
wavelengths.
Electromagnetic radiation has the
properties of both
and
.
The longer wavelengths,
, are truly traveling in waves.
The shorter wavelengths,
are best described as
particles or
because they are so
small
The
is the
, from thousands of kilometers
to a few centimeters in length.
Radio dishes are use to capture radio
waves from space.
The prime purpose of
radio is to convey
information from one
place to another
through the intervening
media (i.e., air, space,
nonconducting
materials) without wires
Microwaves are next with a
wavelength of a few centimeters to 0.1
centimeters.
We use microwaves to cook food.
Infrared radiations are measured in
is one
10-9
The wavelength of
to
is
or
.
Infrared radiations can’t be seen, but
can be felt as heat and registers on a
thermometer.
This is the radiation from the sun that
warms us.
In restaurants, infrared lights keeps
food warm
is used in equipment
to help people see at night and to
detect heat radiation.
is a very narrow band of
radiation ranging from
Visible Light is made up of the
.
has the
has the
and the
and the
The energy of blue light is used to treat
infants with
has shorter wavelengths than
visible light, from
It also has high energy levels.
This penetrating radiation can cause harm
to living tissue, resulting to biological
systems or irreparable damage to cells
It may be harmful in some ways but we still
need some UV radiation for it is required
for us to produce Vitamin A in our skin to
prevent the disesase called
It is used also as a
kill
.
to
X-rays have a wavelength in
of
a meter range.
The shortest wavelength is
in the
.
These wavelengths are so tiny that scientists use
the
to describe them.`
An
is the energy that electron gains
when it falls through a potential difference, or
voltage, of one volt.
has a wavelength of about
0.0001 centimeter.
The
is from
to
range from
to
.
.
can
and
can
are produced in
and
are used to examine bones and teeth, as
these materials
the X-rays to
pass through them as easily as body tissue.
The
is
the term use for all the
wavelengths of light.
It includes:
1. Radio wave 5. ultraviolet light
2. microwave 6. X-rays
3. Infrared
7. Gamma rays
4. visible light
1.
2.
3.
4.
5.
6.
7.
Radio wave - thousands of kilometers to a few
centimeters in length
Microwave - few centimeters to 0.1
centimeters.
Infrared – 0.1 cm to 700 nanometers
Visible Light – 100 to 400 nanometers
U-V light – 10 to 300 nanometers
X-rays - 100ev to thousands of ev
Gamma Rays – thousands of ev to billions of ev