Radios
In the works by Larissa Gartner (lgartner7)
Radios
Radios are everywhere. Between the music in a car or coded messages in a war, Radios are important to life. To create a radio wave, you use Electromagnetics. Circuits, resisitors and capacitors are used. With Radios people can create anything and communicate. Here is a video to watch and learn about how radios inspire those around you. Radio ad by MTN.
How it works
Radio waves are a type of electromagnetic wave. They travel through the air at the speed of light. These waves can be produced through circuits. Through the acceleration of charged particles, radiation is created. This radiation is in the form of Electromagnetic Radiation. Curcuits are used with capacitors to create this accelerated particle within the circuit. Mathmatecally you can portray these waves as sine or cosine waves. These have a fixed frequency and follow the formula asin(w+phase). A is amplitude, w is the angular frequency and phase is the amount the wave is displaced from the origin.
Experiements
Here are some simple radio experiments to help better your understanding on how radios work.
Simple Test One
Take a new 9-volt battery and a quarter. Use an AM radio and tune it to channel with static. Hold the battery near the antenna and tap the two terminals on the battery with the coin. Keep connecting this and un-connecting this. The connection and disconnection of the coin onto the battery creates a crackle in the radio. This test shows how any circuit can produce these waves, if the charged particle is accelerating.
Connection
- How is this topic connected to something that you are interested in?
- How is it connected to your major?
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- Is there an interesting industrial application?
A Mathematical Model
What are the mathematical equations that allow us to model this topic. For example [math]\displaystyle{ {\frac{d\vec{p}}{dt}}_{system} = \vec{F}_{net} }[/math] where p is the momentum of the system and F is the net force from the surroundings.
A Computational Model
Here is a Matlab program that creates a sound out of waves. Radio waves have specific frequencies that can be heard with the human ear. This code specifically generates a siren so you can see and hear the wave. Click this link to download the Matlab code. I recommend starting the code with makesiren(250,200,.5,8000,1,10).
History
There is a lot of debate on who created the first radio. In 1894 a man named Guglielmo Marconi became interested in the work of the physicist Heinrich Hertz. Hertz discovered waves that were produced from Electromagnetic interaction. From this information, Marconi started to create wave making equipment. With this equipment, he started to send signals in a mile radius. Nikola Tesla is said to have created plans for a radio in 1892. By 1896 Tesla created a radio-controlled robotic boat. He drove this boat in the waters of Manhattan from Madison Square Garden using a remote. At the same time, Marconi was broadcasting up to a 12 mile radius, with help from the British Post Office. By 1899 his signal was sent and recieved across the English Channel. Marconi started to work towards a transatlantic radio signal. By 1901, he created such signal, as well as a long-distance wireless telegraph. Tesla claimed he created the Telegraph in 1893.
In 1909 Marconi received a noble peace prize for his work in radio.
Fun fact! (also sad fact) Marconi Company Radios were used on the Titanic in 1912. These radios helped the crew contact Carpathia, another boat, to pick up the survivors.
In 1943 the US Supreme Court discredited some of Marconi's patents because of Tesla's work.
See also
Are there related topics or categories in this wiki resource for the curious reader to explore? How does this topic fit into that context?
Further reading
Books, Articles or other print media on this topic
External links
References
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