Today in Physics we began class by turning in three worksheets: "Starlight, Starbright," the EM table and the Properties of Light guided reading. Afterwards, Mr. Ebersole did a color demonstration using red, blue and green neon tubes attached at an axis. When he spun the wheel, all of the colors mixed to form white. When he then taped off varying sections of each tube, different color combinations could be observed. Trevor made an interesting observation at our table. He said that the reason we hadn't seen purple very well was because Mr. Ebersole had taped the green tube too far down so that when the tubes spun, the centrifugal force of the liquid in the tubes consolidated at the outer side of the tube where the tape did not reach.
Following this demonstration, a presentation was introduced about light and color that is to be given on Tuesday, April 17, 2012. We were given the rubric and requirements necessary to prepare the presentation. Next we worked as a table on a lab about color. We began by putting different colored sheets of glass in front of a flashlight. Then, we switched off between answering questions from the packet we received in class and provided web links on the computer. Anything we did not complete was homework. Also, if we wished to get ahead and be able to work on our presentation the next day, pages 179-185 were to be completed in the lab manual.
QOTD: Why are there different primary colors for light than there are for pigments?
When combining light, red, blue and green are the primary colors. When combining pigments, the primary colors are magenta, yellow and cyan. This is because when combining pigments, light is absorbed and the result is always darker. When combining light, mixing red, blue and green will result in white, as we found in the color demonstration. However, mixing red, blue and green pigments will yield a dark brown.
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