2.  The prime purpose of radio
is to convey information  Radio waves have the
from one place to another. longest wavelengths in the
electromagnetic spectrum.
Radio waves do more than
just bring music to your
radio. They also carry
signals for your television
and mobile phones. Mobile
phones use radio waves to
transit information they are
smaller than TV and FM
radio waves.

3.  What is wireless
technology ?
Wireless is a term used to describe
telecommunications in which
electromagnetic waves carry the signal
over the communication path.
 Why is it so useful?
It goes where the wire/cable cannot
(Wireless analytical systems utilize field-
replaceable lithium thionyl chloride
power modules, requiring no external
power sources or additional wiring.) it
provides broadband access extension,
it is cost effective and it increases
efficiency. It is used on most things we
use daily like mobile phones, internet
and home entertainment systems.
Wireless enables a fully comprehensive
access technology portfolio to work with
existing dial, cable, and DSL
technologies.

4.  Radio is one of our most important ways of communicating.
 Radio waves have frequencies from 300 GHz to as low as 3 kHz,
and corresponding wavelengths from 1 millimeter to 100
kilometers
 Radio stations arrange songs and programs of particular genres
to broadcast to listeners who tune in to hear them. Most stations
provide short newscasts and talk radio provides a public forum
where people can listen to interviews or call in to speak with the
host or his or her guests. Sports events can be broadcast as an
announcer provides a play-by-play description of the action.
Companies can buy ad space on privately owned stations to air
commercials designed to appeal to that station's listeners.
Commercial vehicles such as taxis, trucks, and airplanes use
radios to receive directions and report difficulties. Construction
crews, farmers, ranchers, and other groups use radio to send
and receive information such as instructions and warnings. Radio
is used extensively in the military to facilitate communication
between bases, ships, planes, military vehicles, and field units

5. A microwave oven is a
kitchen appliance that heats
food by dielectric heating,
using microwave radiation to
induce polarized molecules
within the food. A microwave
tube
(usually a magnetron)
converts 60 Hz electric power
into an electromagnetic
wave, with
standardized frequency of
2.45 GHz. Below is a figure
from the original patent
drawn by Dr.Percy Spencer
of Raytheon Corporation, in
1950 (the first experiments
date from 1946).

6. Bluetooth is a wireless
technology for exchanging
data over short distances. It is
used with mobile phones
consoles and PC’s. Bluetooth
uses a radio technology called
frequency-hopping which
chops up the data being sent
and transmits bits of it on up to
79 bands. Because the devices
use a radio communications
system, they do not have to be
in visual line of sight of each
other, however beams of
radiation roaming in free
space which are limited in
terms of wavelengths and
diffractions(quasi optical) must
be viable.

7.  Wi-Fi is a wireless networking technology
that uses radio waves to provide wireless
high-speed Internet and network
connections. It works without any wires
between the receiver and sender using
Radio Frequency technology, a frequency
that involves radio wave propagation.
When an RF current is equipped to an
antenna, an electromagnetic field is
conceived that then is able to reproduce
through space.

8.  Radar is an object-  If the wavelength is
detection system which much shorter than the
uses radio waves to target's size, the wave
determine the direction, will bounce off in a
speed, altitude, or range similar way to how light
of objects. It can be is reflected by a mirror. If
used to detect aircrafts, the wavelength is much
weather forecasts, longer than the size of
guided missiles and the target, the target is
motor vehicles and likely not to be visible .
terrain. Electromagnetic Short radio waves reflect
waves scatter from any from curves and corners
large change in the like a sparkle from a
dielectric constant or broken bit of glass.
diamagnetic constants.

9.  Radio waves are important and they
dominate most of today’s ways of
transmit information in technology, being
the longest wavelength in the spectrum.
It is also faster, abrupt and economical
way to transmit information. Without
radio waves there would not be any
good devices out there, the world is
dependant upon radio waves to deliver
great service.

10.  WORD INFO (2012) Wireless communications with electromagnetic waves [WWW] Word
info. Available from: http://wordinfo.info/unit/4003/ip:1/il:W [Accessed 28/01/2012].
 KIMALDI (2012) Wireless technology advantages [WWW] Kimaldi. Available from:
http://www.kimaldi.com/kimaldi_eng/knowledge_area/wireless_technology/wireless_techn
ology_s_advantages [Accessed 28/01/2012]
 CROWN (2011) Wireless communications [WWW] is4Profit. Available from:
http://www.is4profit.com/business-advice/it-telecoms/wireless-communications/the-
benefits-of-wireless-communication.html [Accessed 28/01/2012]
 Bluetooth. 2012. Bluetooth. [ONLINE] Available at: http://thingsfinder.com/info/bluetooth/
[Accessed 30 January 2012].
 IEEE Xplore - Sign In. 2012. IEEE Xplore - Sign In. [ONLINE] Available at:
http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=00175252. [Accessed 30 January
2012].
 What is Wi-Fi? - A Word Definition From the Webopedia Computer Dictionary. 2012.
[ONLINE] Available at: http://www.webopedia.com/TERM/W/Wi_Fi.html. [Accessed 30
January 2012].
 Radar - Wikipedia, the free encyclopedia. 2012. Radar - Wikipedia, the free encyclopedia.
[ONLINE] Available at: http://en.wikipedia.org/wiki/Radar [Accessed 30 January 2012].
 Microwave oven - Wikipedia, the free encyclopedia. 2012. Microwave oven - Wikipedia,
the free encyclopedia. [ONLINE] Available at:
http://en.wikipedia.org/wiki/Microwave_oven. [Accessed 30 January 2012].
 2012. . [ONLINE] Available at: http://emlab.uiuc.edu/ece350/suppnotes/moven.pdf.
[Accessed 30 January 2012].