radio waves.pptx

8/11/2019 RADIO WAVES.pptx

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The iscovery of Radio Wa First predicted by mathematics by James Clerk

Maxwell Proved by Heinrich Rudolf Hertz , German

physicist First successful attempt was in 1886. Unit of frequency - is named the hertz. First to prove existence of electromagnetic waves. Engineering instruments, transmitting and

receiving radio pulses.


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Conceptual Schematic of Hertz sExperiment


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Type of electromagnetic radiation. Lower frequencies and longer wavelengths than microwaves. Frequencies from 300 GHz to 3 kHz.

Wavelengths from 1 millimeter to 100 kilometers. They travel at the speed of light. Make electrons in copper wire move. Generate electric currents in the wire.


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A direct electrical current is applied to a wire. An electromagnetic field is built around.

This field sends a wave outward from the wire. When the current is removed, the field collapses. This sends out another wave.

The current is applied and removed over and overfor a period of time. a series of waves is propagated at a discrete

frequency.


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convey information from one place to another through

non-conducting materials without wires Radio waves are sent out at specific frequencies. Resonators are used to capture radio waves of a particular

frequency. Radio waves can also be converted into images. E.g. AM/FM Radio Stations, Space Probes, Television, Wi-Fi


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Parabolic Antennas

An antenna that usesParabolic Reflectors

Works like a funnel(catching a wide range ofwaves and directing to acommon point called focus)

Receives information fromsatellites


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Uses of Radio Waves: Medicine

Radio frequency (RF) energy used in medicaltreatments: For minimally invasive surgeries

and coagulation.Magnetic resonance imaging (MRI) uses radio

frequency waves: Generate images of the human body


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USES OF RADIOWAVES:

NAVIGATION RADARAs radio waves reflects, they can be used to: Detect the presence of an object

Detect the speed of an object Map somethingRadar is used by: Air traffic control to track and guide planes

Traffic police to track speeding vehicles Military to track weapons Meteorologists to track storms, volcanoes and

hurricanes


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Dangers of radio waves

A study published in 2008 found that-Exposure to phone signals for 5 minutes could: Stimulate human cells to divide.

Although this occurs naturally when tissue grows, Its also a key to the development of cancer.As some people suffer from EMF sensitivity, they experience:

Headaches Tinnitus Nausea Stomachahces


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Short for: Search For Extra Terrestrials. An organization funded by the US government

and the public. Radiation is monitored for signs of alien

transmissions constantly. This organization is stemmed from the Drake

Equation. Calculates probabilities of intelligent alien

civilizations.


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Fun Fact: Do you know that you can contribute to thesearch of intelligent extra-terrestrial life too?

You can download the Berkeley Open Infrastructure for NetworkComputing (BOINC) software program,

By doing so, the program can run as a background process that uses idlecomputer power.

You can use your computer to help computate scans and information

gathered.


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Did you also know that

Radio wave lengths can vary from the size offootball fields to a football?


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http://www.photo-dictionary.com/photofiles/list/7780/10458vintage_radio.jpg http://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-

14.htm http://hypescience.com/wp-content/uploads/2012/02/Heinrich_Hertz.jpeg http://renjiveda.files.wordpress.com/2012/02/hertz_table.jpg

http://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.png https://reader010.{domain}/reader010/html5/0613/5b20884ac7df2/5b20885453f54.jpg http://www.earthisland.org/eijournal/winter2012/images/larger/antenna.jpg http://apod.nasa.gov/apod/image/0803/planetalignment_white_big.jpg http://en.wikipedia.org/wiki/File:SETI@home_Multi-Beam_screensaver.png http://themommaven.com/wp-content/uploads/2012/07/MRI.jpg http://users.ox.ac.uk/~sant1114/HappyRadio.JPG
http://www.photo-dictionary.com/photofiles/list/7780/10458vintage_radio.jpghttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://renjiveda.files.wordpress.com/2012/02/hertz_table.jpghttp://renjiveda.files.wordpress.com/2012/02/hertz_table.jpghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://www.wallpaperzzz.com/wallpapers/normal/hires/radar.jpghttp://www.earthisland.org/eijournal/winter2012/images/larger/antenna.jpghttp://en.wikipedia.org/wiki/File:SETI@home_Multi-Beam_screensaver.pnghttp://themommaven.com/wp-content/uploads/2012/07/MRI.jpghttp://themommaven.com/wp-content/uploads/2012/07/MRI.jpghttp://themommaven.com/wp-content/uploads/2012/07/MRI.jpghttp://themommaven.com/wp-content/uploads/2012/07/MRI.jpghttp://themommaven.com/wp-content/uploads/2012/07/MRI.jpghttp://en.wikipedia.org/wiki/File:SETI@home_Multi-Beam_screensaver.pnghttp://en.wikipedia.org/wiki/File:SETI@home_Multi-Beam_screensaver.pnghttp://en.wikipedia.org/wiki/File:SETI@home_Multi-Beam_screensaver.pnghttp://en.wikipedia.org/wiki/File:SETI@home_Multi-Beam_screensaver.pnghttp://www.earthisland.org/eijournal/winter2012/images/larger/antenna.jpghttp://www.earthisland.org/eijournal/winter2012/images/larger/antenna.jpghttp://www.wallpaperzzz.com/wallpapers/normal/hires/radar.jpghttp://www.wallpaperzzz.com/wallpapers/normal/hires/radar.jpghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://4.bp.blogspot.com/-9otjWKPVGHo/T2IBq-a2f_I/AAAAAAAAArg/1K12U3cjZH0/s1600/RetroEarthRadioTowerWp-long+goodbye.pnghttp://renjiveda.files.wordpress.com/2012/02/hertz_table.jpghttp://renjiveda.files.wordpress.com/2012/02/hertz_table.jpghttp://renjiveda.files.wordpress.com/2012/02/hertz_table.jpghttp://renjiveda.files.wordpress.com/2012/02/hertz_table.jpghttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://www.zastavki.com/eng/Funny_wallpapers/Creative_Wallpaper/wallpaper-14581-14.htmhttp://www.photo-dictionary.com/photofiles/list/7780/10458vintage_radio.jpghttp://www.photo-dictionary.com/photofiles/list/7780/10458vintage_radio.jpghttp://www.photo-dictionary.com/photofiles/list/7780/10458vintage_radio.jpghttp://www.photo-dictionary.com/photofiles/list/7780/10458vintage_radio.jpg


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http://www.juliantrubin.com/bigten/hertzexperiment.html ,http://en.wikipedia.org/wiki/Heinrich_Hertz

http://wiki.answers.com/Q/Explain_the_properties_of_radio_waves http://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-

a-radio-wave.html http://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-

discoveries.htm#page=10
http://www.juliantrubin.com/bigten/hertzexperiment.htmlhttp://en.wikipedia.org/wiki/Heinrich_Hertzhttp://wiki.answers.com/Q/Explain_the_properties_of_radio_waveshttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://science.howstuffworks.com/innovation/scientific-experiments/10-obvious-research-discoveries.htmhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://www.qrg.northwestern.edu/projects/vss/docs/communications/3-how-do-you-make-a-radio-wave.htmlhttp://wiki.answers.com/Q/Explain_the_properties_of_radio_waveshttp://en.wikipedia.org/wiki/Heinrich_Hertzhttp://www.juliantrubin.com/bigten/hertzexperiment.html

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