Elvira Goloborodko Science color 11/3/14 You may use any reliable source to investigate and find the information needed to complete this assessment. Recall that personal web pages, company advertisements, and other similar web based resources may not be reliable. The best resources will be governmental, educational, or scientific in origin. 1. In your own words, explain how Doppler radar works. Describe the properties of electromagnetic waves and interactions that make Doppler radar possible. (13 points) A Doppler radar is an important tool used to measure the velocity and direction of a moving object. The Radar actually has transmitters that produce and release electromagnetic waves in the form of microwaves or radio waves. These waves are sent out and when they reach something they reflect or bounce back to the source or transmitter. It is noticed that when the waves are reflected back they are much weaker but the machines are able to amplify them to get an accurate reading from them. This process determines and measures the distance of the object its reading. 2. In your own words, explain how polarized sunglasses work. Describe the properties of electromagnetic waves and interactions that this technology targets. (13 points) Polarized lenses contain a special filter that reflects the suns’, sometimes, dangerous glare. An Electromagnetic Wave from the sun such as light usually reflects horizontally off of surfaces. This process produces a super annoying glare that polarized sunglasses restrict from affecting your eyes. 3. In your own words, explain why we see a rainbow or colorful sunset. Explain the properties and interactions that make this display possible. (13 points) Sunlight is actually made up of a whole range of colors but when all these colors are combine it is seen as white. When the light passes through different types of mediums to others, for example humidity or air, it changes colors. Also, when you notice that band of colors from a rainbow you’re seeing different types of raindrops altering and reflecting the light making it into that familiar smooth, but still odd form. Particles from Earth’s atmosphere and such cause the wavelengths of sunlight to change colors depending of the positioning of the sun. 4. Discuss the dual nature of electromagnetic waves and how they travel in a vacuum and through a medium. (13 points)
Electromagnetic waves are not limited to just having to travel through a medium like mechanical waves. Although they are very different they are both measured by frequency. I’ve noticed that when an electromagnetic wave travels through a medium it is significantly slower than when traveling through a vacuum. An example of an electromagnetic wave is light. Light can be made of particles which are made of several packets of energy called photons. Some qualities of Photons are that they have a forward force, have no mass, and travel at the speed of light. Light could also be a wave.
5. You must include citations for all reliable sources used. Include citations from three or more reliable sources. (8 points) 6. Work cited
7. 1. Sandhyarani, Ningthoujam. "How Does the Doppler Radar Work." Web log post. Buzzle.com. Buzzle.com, 26 Sept. 2011. Web. 02 Nov. 2012. <http://www.buzzle.com/articles/how-does-doppler-radar-work.html>.
2. Morgan, Erinn, and Burt Dubow, OD. "Polarized Sunglasses." All About Vision. Access Media Group LLC, Apr.-May 2012. Web. 02 Nov. 2012. <http://www.allaboutvision.com/sunglasses/polarized.htm>.
3. Livingston, William, and Charles Knight. Rainbows. Rep. Ed. Seth Sharless. Boulder: National Center for Atmospheric Research, n.d. Web. <http://http://eo.ucar.edu/rainbows/>.
4. "Sunrise and Sunset Colors." Stuff in the Sky. National Center for Atmospheric Research, n.d. Web. 02 Nov. 2012. <http://www.eo.ucar.edu/kids/sky/colors3.htm>.