2. Electromagnetic spectrum and its uses
THE ELECTROMAGNETIC SPECTRUM IS THE RANGE OF ALL TYPES OF
ELECTROMAGNETIC RADIATION. THIS RADIATION IS A TYPE OF ENERGY
THAT TRAVELS THROUGH SPACE AT THE SPEED OF LIGHT AND IS
CHARACTERIZED BY ITS WAVELENGTH AND FREQUENCY. THE
ELECTROMAGNETIC SPECTRUM IS TYPICALLY DIVIDED INTO SEVEN
REGIONS, IN ORDER OF INCREASING FREQUENCY AND DECREASING
WAVELENGTH: RADIO WAVES, MICROWAVES, INFRARED RADIATION,
VISIBLE LIGHT, ULTRAVIOLET RADIATION, X-RAYS, AND GAMMA RAYS. EACH
REGION OF THE ELECTROMAGNETIC SPECTRUM HAS ITS OWN UNIQUE
PROPERTIES AND USES.
3.
4. โข Radio waves have the longest
wavelengths and the lowest
frequencies. They are used for
a variety of communication
purposes, including television
and radio broadcasting, cell
phone communication, and
satellite communication.
5. โข Microwaves have shorter
wavelengths and higher
frequencies than radio waves.
They are used for a variety of
purposes, including cooking
food, transmitting data, and
radar.
6. โข Infrared radiation has shorter
wavelengths and higher
frequencies than microwaves. It
is emitted by warm objects and
is used for a variety of
purposes, including thermal
imaging, remote control, and
heating.
7. โข Visible light has wavelengths
that are visible to the human
eye. It is used for a variety of
purposes, including lighting,
communication, and
entertainment.
Ultraviolet radiation has
shorter wavelengths and
higher frequencies than
visible light. It is used for a
variety of purposes, including
sterilization, tanning, and
analysis of materials.
8. โข X-rays have shorter
wavelengths and higher
frequencies than
ultraviolet radiation.
They are used for a
variety of medical and
scientific purposes,
including imaging and
analysis of materials.
9. โข Gamma rays have the
shortest wavelengths
and the highest
frequencies. They are
used for a variety of
purposes, including
cancer treatment and
imaging.
