1. COVER PAGE2. CONTENTS3. ELECTROMAGNETIC EXPLAINATION OF RADIO WAVES4. WIFI5. PROPERTIES OF WIFI6. MRI (magnetic resonance imagining)7. RADAR8. CELL PHONES AND WALKIES9. THE END THOUGHT10. BIBLIOGRAPHY
Radio waves as you can see in the diagram below are thelongest in wavelength and lowest in level of frequency (wavesper second) this is shown from the curvature on the diagramRadio waves have managed to give visuals, audio and text basedcommunication. These sources of communication have a range of20KHz to 100GHz with mediums such as TV being further up thespectrum and AM Radio at the lower end
Wifi transmits at a frequency of 2.4 or 5 GHz (gigahertz) which is way higher than most radio broadcasters such as TV, Mobile Phones and Walkie Talkies for example. The higher frequency results in more information to be carried across and received. Wifi allows multiple wireless devices to run through 1 router which is connected to your computer usually through your house phone connection. WiFi is similar to Radio and TV when carrying information, it uses binary in 1’s and 0’s which is then received visa versa and then decoded. Standard Wireless Routers in homes have an average coverage of 30 meters in all directions. For example, in most homes only one main computer is plugged into the router and uses something called a Ethernet cable to get the wireless service. This allows several devices such as; laptops, mobile phones and other portable devices with the same capability to use the same connection without any cables attached, hence wireless connection. This in conclusion is cost effective for users as they need only 1 transmitter instead of many and allowing for greater productivity also as you can move from room to room without disconnecting, also travellers who often use laptops on trains take advantage of the capability to get work done on the move.
Although great most of the time, the downside to this multiple source ofconnectivity is that if many people try to use high bandwidth applications at thesame time the connection can suffer levels of interference in terms ofperformance. Ultimately you can lose connection altogether for a period of timeif too many people are actively using it. Which in turn makes people angry ashell when a 30 second video clip takes 5 minutes to load.
MRI machine are often used to explore thehuman infrastructure. This is achieved byusing magnets and radio waves thatspecifically pick up hydrogen moleculesalone. The waves travel through the humanbody and set off reactions within cells thatgive off radio signals.
THE PROCESS OF RADARFor example, a radar gun used by police is simply a radiotransmitter and receiver. An amplifier is used to then intensify thesignal which is then sent out through an antenna. The wavesthen bounce back (at the speed of light ) to the receiver which ischannelled through the antenna then converted back to anelectrical current . Radar in its simplest form is used todetect the distance of objects by using concentratingradio waves and waiting for an echo to reflect back. Thetime of the returning echo calculates the distance.USES OF RADAR• Detecting planes on ground & air to guide landings.• Police use it to monitor speed• Space operations, tracking satellites and debris.• Aiding the military in locating the enemy, land & sea.• Tracking wind pressure, hurricanes etc. Use of radar on speeding car• Even entering supermarkets through automatic doors.
The cellular telephone system is a great system that divides a city into sections of cells. This division of cells allows multiple reuse of extensive frequencies which in turn allows millions of cell users to operate phones Simultaneously.A cell phone system operates on a full-duplex radio system whichtransmits 2 different frequencies so the communication can take placeand make a 2 way conversation. Each cell is usually on average 110square miles in all directions. The cellular approach means phone convo’scan have an incredible range and allow people to be hundreds of milesapart and keep the connection compared to a walkie talkie for examplethat can only receive from a mile or 2 at the longest. Walkie Talkie work ona half – duplex system..This means only 1 channel can be used but withmany users on 1 frequency. This means like we know, that only1 personcan talk at a time.Although cellular phones have the advantage of shifting its frequency andcell to get great coverage, thick walls or surfaces like bridges etc still canlead to connection failure. This is something walkie talkies can do withoutfail.