HWK43s_G11(1) - only that colors frequency. (Each pigment...

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HWK 43 (11th grade) (SOLUTIONS) (due 5/18/07) Read chp. 27 (pages 404-405, 408-411) Read chp. 28 (pgs: 421-431) Do Chp. 27: 7, 8 Do Chp. 28: 6 (a and b), 7, 14 27.7: The color spectrum is a subset of the electromagnetic spectrum. It is the set of visible frequencies, ranging from red (lowest visible frequency) to violet (highest visible frequency). 27.8: Infrared (IR) frequencies are lower than visible frequencies which are lower than ultraviolet (UV) frequencies. 28.6 (a and b): A red transparent object transmits red light. It absorbs all other colors. 28.7: A pigment’s function is to selectively absorb light of certain frequen- cies while reflecting others. By combining diFerent pigments, artists can create a desired color by mixing pigments that together, reflect
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Unformatted text preview: only that colors frequency. (Each pigment would reect this desired frequency, while collectively, absorbing all others. This is what we call mixing colors by subtraction.) 28.14: Continuing the discussion begun in the above problem (7), we mix pigments to form a paint. The rst pigment reects the desired fre-quency (or color, or hue), but it also reects other unwanted colors. So we mix in further pigments whose real functions are to absorb the un-wanted colors while still reecting the desired color. This is why we call it mixing by subtraction. We get what we want by subtracting what we dont want from the rst pigment. 1...
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