2. IntroductionThis slide show will take you through manyideas surrounding radio waves; The basics- What is a radio wave? Use and importance of radio waves Radio waves beyond radio broadcasting Radio wave use in mobile phones
3. What Is A Radio Wave? Radio waves are part of theelectromagnetic spectrum and cover a largepart of it, the wavelengths can range fromcentimetres to hundreds of meters and aresignificantly large in comparison to that at thesmaller end of the spectrum, forexample, gamma rays which have wavelengthswhich are measured in nanometres.Radio waves send audio, text and images intheir waves.
4. Radio Wave Diagram The diagram shows the area which Radio waves cover on theelectromagnetic spectrum, ranging from FM and AM radio waves to long radiowaves. The wave length increases towards the right of the diagram making radiowaves the longest wavelength within the whole electromagnetic spectrum as well ashaving the largest range in wave size throughout the spectrum. The visible light spectrum is shown in the centre, this is the visible part ofthe spectrum and because radio waves are not within this range, it means that theyare not visible to the human eye.
5. Radio wavesAM and FM waves are themost known radio waves,because of the common name,the radio and radio waves.The invention of the radio hasbeen claimed by many peopleincluding Nikolas Telsa andGuglielmo Marconi, who waslater offered the patent for radioin 1896.Broadcasts of radio firstoccurred in the early 1900,developing from one to onecommunication to one to manycommunication. Firstly thoughtto be a weakness but later Marconi- offered the patent for the radiobecame the entertainmentwithin everyone’s homes andthe information service for thewar.
6. Importance of Radio Waves Radio waves has been one of the most important advances inthe20th century and can communicate information all over the world. Not only communication, but things like SatNav, remote controlsand every day household items rely on radio waves and radiotechnology, without it, today, we’d be living very different lives. Radio technology is responsible for overseas connections andwas the first technology to combat the problem of overcoming distance ina shorter period of time. Without Radio waves, modern forms ofcommunication would be almost impossible and we’d still be sendingthings over shore on a wooden boat by letter!
7. Use of radio wavesThe many uses of radio waves: Radio’s are used in ambulances to communicate with hospitals on patients and location Radio telescopes use radio waves, these pick up radio waves which are detected outside the earth, waves which are emitted from stars and planets Radio waves are used on ships to determine location and can be used as a compass
8. Continued… Radio waves have been a part of surgery for over 75 years making them less invasive. As well as this, MRI scans are produced by Radio waves to create images of the body. These are less harmful than X-Rays which are another way to generate images of the body. Radio waves have also been researched to cure some cancers because they don’t damage the body tissue. Radio wave technology has been developed in agriculture to destroy harmful and invasive insects, despite this it hasn’t been applied as of yet.
9. Radio waves beyond broadcasting As you have seen in previous slides, radiowaves are not only used for radio broadcast but inmany ways, radio waves branch out further fromAM & FM waves and are used in mobilecomputing and wireless internet. The next three slides take you through inmore detail about the application of radio waves inmobile phone technology.
10. Radio wave technology: Mobile Phones Mobile phones, or “cell phones” as they areknown globally, operate using Radio wavetechnology. Mobile phones operate in a different wayto that of the home phone; wired or wireless. Mobile phones work in a Cellular pattern, whereareas are divided in to cells, which allows mobiles tooperate within that cell. Base stations within the cellsmake up the network, these base stations have atransmitter tower and a radio. Likewise, mobile phones have low powertransmitters in them which allow them to connect tothe transmitters at base stations.
11. Continued… Mobile phones emit radiofrequencies to work, the frequency of amobile phone lies between FM Radiowaves and Microwaves. Things which effect thesignal of a mobile phone include wherethe hand is on the mobile; placementwith in a “cell”; the amount of peopleusing mobile phones within a cell. Thesignal is changed because less radiowave signals are being exchangedbetween the base station and themobile phone.
12. Continued… There are many health concerns which surround mobilephone technology. Microwaves have the ability to heat up bodytissue and transform body cells if we are openly exposed to it.Because mobile phone radio wave frequency lie between FMfrequency and Microwave frequency, there have been concernsas to whether if exposed to too many radio wave frequenciesfrom our mobiles if we are at risk of cancer. High levels of these waves from mobile phones wouldcause us damage, however because of the low frequencytransmitters in our phone, risk is low. Many studies have taken place as to whether there are alink between mobile phone use and brain tumours however thereis no conclusive evidence as of yet that they do.
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