Works Cited

Works Cited

Brain, Marshall. "How Radio Works." HowStuffWorks. N.p., n.d. Web. 12 Feb. 2013. <http://electronics.howstuffworks.com/radio.htm>

"Radio Transmission." PBS. PBS, 2005. Web. 12 Feb. 2013. <http://www.pbs.org/wgbh/aso/tryit/radio/radiorelayer.html>

"Sinusoids: Applications and Modeling." Sinusoids: Applications and Modeling. Demos with Positive Impact, 15 Sept. 2010. Web. 18 Feb. 2013. <http://www.mathdemos.org/mathdemos/sinusoidapp/sinusoidapp.html>.

Woodford, Chris. "Radio." Explain That Stuff. N.p., 2 July 2012. Web. 8 Feb. 2013. <http://www.explainthatstuff.com/radio.html>

Welz, Gary L. "Wave Mathematics." Visionlearning. Visionlearning, 2006. Web. 18 Feb. 2013.
<http://www.visionlearning.com/library/module_viewer.php?mid=131>

Reynolds, Laura. "How Do Radios Produce Sound?" EHow. Demand Media, 28 Oct. 2008. Web. 18 Feb. 2013.
<http://www.ehow.com/how-does_4568349_radios-produce-sound.html>

Application of Sinusoids in Your Daily Life

*Listening to the radio
*Lights 
*Pendulum
*Piston and Crankshaft in an Engine 
*Ferris Wheel
*Energy Bills 
*Stock Prices

Trig Function for Low C

In a radio wave the trig function for low c would be y=a sin(32πx). Where 32π is the frequency and a is the amplitude. The frequency is how many cycles it has in one second and amplitude it the range it has allowing for different volumes.

How to Build a Radio

1. Wrap copper wire around PVC pipe 100-150 times.
2. Drill a hole into each end of the PVC pipe.
3. Have a 5x5 block of pine wood and screw the PVC pipe with the wire wrapped around it down to the block of wood.
4. Attach copper wire to either end of the the wire already attached to the PVC pipe. This wire will serve as the ground wire.
5. On the end that you did not attach the ground wire to, attach another wire that will serve as the antenna.
6. Stick a metal tack into your wood and wrap the wire around it, make sure your antenna is long and is in an area where it can receive waves.
7. Screw down a razor blade to the wood opposite of the PVC pipe, make sure that you blued the razor blade first.
8. Take a pencil and shorten it to about two inches, having one side sharpened and one side cut off.
9. Next take a safety pin, open it up, and push the pointed part into the chopped off end of the pencil, directly into the led.
10. Next put the tip of the pencil so that it is touching the bluest part of the razor blade, and then use a metal tack to pin down the safety pin to hold the pencil in place.
11. Open up a paper clip and attach it to the antenna wire.
12. Make the paper clip attached to the antenna wire able to skim the copper wire on the PVC pipe and then tack the paper clip down using a metal tack.
13. Sand the surface of the copper wire on the PVC pipe where you intend the paper clip to rub.
14. Plug the radio and and see if you made music!

Hint: Make sure that all coating on the wire is rubbed off with sand paper before completing this project.

How to Graph Sinusoids

How to Graph Sinusoid is quite simple.
You need three key things:
Amplitude-- Vertical stretch or shrink
Period-- The time it takes for the graph to complete one full cycle.
Key Point Interval--The x-values where we have minimums, maximums, or cross the center line.
Parent Functions
Cosine
y=cos(x)

Period=2π

Key Point Interval= 2π/4=(π/2)

 

Sine

y=sin(x)

Period=2π

Key Point Interval= 2π/4=(π/2)

For more help go to this link: http://www.youtube.com/watch?v=n5tTAsBJS_g