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 Radio waves are part of a larger family of
  waves on the electromagnetic spectrum.
 They have the longest wave length in the
  electromagnetic spectrum and can range
  from 1 millimetre to hundreds of metres.
 Radio waves have frequencies varying from
  as low as 3 kHz up to 300 GHz.
 They are used for various different forms of
  communication.
This diagram shows radio waves on the electromagnetic spectrum. It shows
the length of the wavelengths for different devices that use radio waves
with radar, television, FM and AM waves. It shows that radio waves not only
have the largest wavelength in the electromagnetic spectrum, they also
have the biggest range in wave size in the spectrum.
Radio waves cannot be seen as they lie outside of the visible light section in
the electromagnetic spectrum.
   Radio waves are very important in everyday
    life.
   They are used for nearly all non-written
    communication and most wireless
    technologies.
   Radio waves transmit
    music, conversations, pictures and data
    invisibly through the air, often over vast
    distances.
   Many common household products require
    radio waves to work. AM and FM
    radios, wireless networks, telephones and
    televisions all require radio waves to operate.
   AM and FM radio broadcasts
   Cordless phones
   Radar
   Garage door openers
   Wireless networks
   Radio-controlled toys
   Television broadcasts
   Mobile phones
   GPS receivers
   Satellite communications
   Police radios
   Wireless clocks
   Many people use wireless
    networking, also known
    as WiFi, to connect to the
    internet via their
    computers, laptops or
    mobile phones.
   It makes internet
    connecting more
    convenient because it
    doesn’t require wires or
    cables and therefore
    allows for roaming.
   WiFi transmits at frequencies of 2.4 GHz or 5
    GHz which is considerably higher than many
    other devices that use radio waves. This allows
    the signal to carry more data, allowing for a
    better internet connection.
   Wireless radio waves can transmit on three
    different frequency bands or, they can
    “frequency hop”, switching between all three
    bandwidths. This helps to reduce interference
    and allows multiple devices to use the same
    wireless connection simultaneously.
   A radar system emits radio
    waves, called radar signals, in
    predetermined directions
    through a transmitter. When
    the signals come into contact
    with an object they are
    reflected and/or scattered
    into different directions. The
    signals that are reflected
    back towards the transmitter
    are the desirable ones which
    make the radar work, making
    the object visible on the
    radar.
   Radar is used in a variety of ways, for example: to
    detect a moving object in the distance; to
    detect the speed of an object; or to map
    something.
   Police use it to detect speeding motorists.
   Planes, both in the air and on land, can be
    detected via radar and air traffic controllers use
    it to guide safe landings.
   The military use radar to detect the enemy and
    to guide weapons.
   NASA use radar to map the Earth and other
    planets as well as tracking satellites.
   Meteorologists can use radar to track
    storms, hurricanes and tornadoes.
   http://en.wikipedia.org/wiki/Radio_waves
   http://www.antonine-
    education.co.uk/physics_gcse/Unit_1/Topic_5/topic_5_wh
    at_are_the_uses_and_ha.htm
   http://passion4science.wordpress.com/2011/08/06/electro
    magnetic-spectrum/
   http://curiosity.discovery.com/question/what-importance-
    of-radio-waves
   http://en.wikipedia.org/wiki/Radio_waves#Radio_commu
    nication
   http://computer.howstuffworks.com/wireless-network.htm
   http://en.wikipedia.org/wiki/Radar
   http://science.howstuffworks.com/radar.htm
   https://marketplace.secondlife.com/ja-JP/p/AWDesigns-
    Radar-V12-BOX-PROMO/1758892?id=1758892&lang=ja-
    JP&locale=ja-JP&slug=AWDesigns-Radar-V12-BOX-PROMO

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Radio Waves

  • 1.
  • 2.  Radio waves are part of a larger family of waves on the electromagnetic spectrum.  They have the longest wave length in the electromagnetic spectrum and can range from 1 millimetre to hundreds of metres.  Radio waves have frequencies varying from as low as 3 kHz up to 300 GHz.  They are used for various different forms of communication.
  • 3. This diagram shows radio waves on the electromagnetic spectrum. It shows the length of the wavelengths for different devices that use radio waves with radar, television, FM and AM waves. It shows that radio waves not only have the largest wavelength in the electromagnetic spectrum, they also have the biggest range in wave size in the spectrum. Radio waves cannot be seen as they lie outside of the visible light section in the electromagnetic spectrum.
  • 4. Radio waves are very important in everyday life.  They are used for nearly all non-written communication and most wireless technologies.  Radio waves transmit music, conversations, pictures and data invisibly through the air, often over vast distances.  Many common household products require radio waves to work. AM and FM radios, wireless networks, telephones and televisions all require radio waves to operate.
  • 5. AM and FM radio broadcasts  Cordless phones  Radar  Garage door openers  Wireless networks  Radio-controlled toys  Television broadcasts  Mobile phones  GPS receivers  Satellite communications  Police radios  Wireless clocks
  • 6. Many people use wireless networking, also known as WiFi, to connect to the internet via their computers, laptops or mobile phones.  It makes internet connecting more convenient because it doesn’t require wires or cables and therefore allows for roaming.
  • 7. WiFi transmits at frequencies of 2.4 GHz or 5 GHz which is considerably higher than many other devices that use radio waves. This allows the signal to carry more data, allowing for a better internet connection.  Wireless radio waves can transmit on three different frequency bands or, they can “frequency hop”, switching between all three bandwidths. This helps to reduce interference and allows multiple devices to use the same wireless connection simultaneously.
  • 8. A radar system emits radio waves, called radar signals, in predetermined directions through a transmitter. When the signals come into contact with an object they are reflected and/or scattered into different directions. The signals that are reflected back towards the transmitter are the desirable ones which make the radar work, making the object visible on the radar.
  • 9. Radar is used in a variety of ways, for example: to detect a moving object in the distance; to detect the speed of an object; or to map something.  Police use it to detect speeding motorists.  Planes, both in the air and on land, can be detected via radar and air traffic controllers use it to guide safe landings.  The military use radar to detect the enemy and to guide weapons.  NASA use radar to map the Earth and other planets as well as tracking satellites.  Meteorologists can use radar to track storms, hurricanes and tornadoes.
  • 10. http://en.wikipedia.org/wiki/Radio_waves  http://www.antonine- education.co.uk/physics_gcse/Unit_1/Topic_5/topic_5_wh at_are_the_uses_and_ha.htm  http://passion4science.wordpress.com/2011/08/06/electro magnetic-spectrum/  http://curiosity.discovery.com/question/what-importance- of-radio-waves  http://en.wikipedia.org/wiki/Radio_waves#Radio_commu nication  http://computer.howstuffworks.com/wireless-network.htm  http://en.wikipedia.org/wiki/Radar  http://science.howstuffworks.com/radar.htm  https://marketplace.secondlife.com/ja-JP/p/AWDesigns- Radar-V12-BOX-PROMO/1758892?id=1758892&lang=ja- JP&locale=ja-JP&slug=AWDesigns-Radar-V12-BOX-PROMO