lightpaper - Megan Thie Light Activity-Related Benchmark...

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Megan Thie October 25, 2007 Light Activity-Related Benchmark Area: Physical Category: Waves and Vibrations Benchmark: Elementary #3- Use prisms and filters to produce various colors of light. Activity Making a Color Viewing Box Materials: 3 shoeboxes with a large rectangular hole cut into the lid Bright flashlight Red, green, and blue cellophane White index cards Red, blue, and green crayons Scissors Tape Directions: 1. Make three boxes with holes cut in each as described. 2. One the index cards make three wide bands of color using the crayons. Each card, for each box, should have the red, blue and green bands arranged in the same order. Tape a card inside each box so that it will be directly below the hole in the lid. 3. Place the green cellophane in the lid of one box and secure it with tape. Do the same with the red and blue cellophane on the remaining two boxes. 4. Shine a flashlight through the colored cellophane lid of each box. Record changes in color of the three bands of color on the white cards when looking into the box with the green, red, and blue cellophane. Results: The cellophane filters only let light that is the same color pass through, while stopping other colors from penetrating. For example, a red filter only lets red light through and stops all other colors. In the box with the green cellophane, the green appears greener, and the red and the blue appear black because only green light is allowed through the filter. In the box containing the red cellophane, the green and the blue bands appear dark. The white card appears red since white reflects all colors and only red is allowed through the filter. This makes the red band difficult to see, since it blends in with the background.
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Credit: "How Science Works." Judith Hann, Dorling Kindersley Limited, 1991, London, p. 96. Explanation 1. Light travels in electromagnetic waves that have different wavelengths, amplitude and frequency. A light wave consists of energy in the form of electric and magnetic fields. The fields vibrate at right angles to the direction of movement of the wave. They also vibrate at right angles to each other. Because light possesses both electric and magnetic fields, it can also be called electromagnetic radiation. The size of a wave, also know as its wavelength, is measured as the distance between any two corresponding points on successive waves, usually peak-to-peak. Light waves come in different frequencies, which differ depending on the color, with red having the smallest frequency and blue with the highest frequency. Frequency can be measured as the number of waves that pass a point in space during any time interval, usually one second. This translates
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lightpaper - Megan Thie Light Activity-Related Benchmark...

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