References
http://www.physicsclassroom.com/class/waves/Lesson-1/What-is-a-Wave (1996-2015) Physics Classroom
http://www.britannica.com/science/wave-velocity (2015) Encyclopedia Britannica, Inc.
http://www.explainthatstuff.com/microwaveovens.html
http://www.kitchendaily.com/read/difference-between-convection-and-conventional-ovens
http://www.explainthatstuff.com/radio.html
http://www.cnet.com/au/news/digital-radio-all-you-need-to-know/
http://www.ehow.com/about_6301732_analog-vs_-digital-radios.html
http://computer.howstuffworks.com/wireless-network.htm
https://www.youtube.com/watch?v=HozA0hGo_AA
http://satellites.spacesim.org/english/function/communic/index.html
http://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-a-satellite-58.html
http://electronics.howstuffworks.com/satellite-tv1.htm
http://www.mio.com/technology-gps-work.htm
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/ultrasound_scan
http://www.webmd.com/a-to-z-guides/what-is-an-ultrasound
http://science.howstuffworks.com/ultrasound.htm
http://www.physics.org/article-questions.asp?id=55
http://www.parents.com/pregnancy/my-baby/gender-prediction/finding-out-babys-sex/
Evergreen . M. J. & Graeme . L. (2012) Science Quest 9
http://www.britannica.com/science/wave-velocity (2015) Encyclopedia Britannica, Inc.
http://www.explainthatstuff.com/microwaveovens.html
http://www.kitchendaily.com/read/difference-between-convection-and-conventional-ovens
http://www.explainthatstuff.com/radio.html
http://www.cnet.com/au/news/digital-radio-all-you-need-to-know/
http://www.ehow.com/about_6301732_analog-vs_-digital-radios.html
http://computer.howstuffworks.com/wireless-network.htm
https://www.youtube.com/watch?v=HozA0hGo_AA
http://satellites.spacesim.org/english/function/communic/index.html
http://www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-a-satellite-58.html
http://electronics.howstuffworks.com/satellite-tv1.htm
http://www.mio.com/technology-gps-work.htm
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/ultrasound_scan
http://www.webmd.com/a-to-z-guides/what-is-an-ultrasound
http://science.howstuffworks.com/ultrasound.htm
http://www.physics.org/article-questions.asp?id=55
http://www.parents.com/pregnancy/my-baby/gender-prediction/finding-out-babys-sex/
Evergreen . M. J. & Graeme . L. (2012) Science Quest 9