Chem BL CPR writing assignment PDF

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Mandatory Chem 14BL writing assignment ...

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1. What wavelengths of light make up the visible region of the electromagnetic spectrum? 2. How are the various colors distributed along the visible spectrum? (What color corresponds to the smallest wavelengths, etc.) 3. What is the composition of white light? 4. How can the color wheel contribute to our understanding of the color of objects we see? 5. How is an object's color related to reflected light, absorbed light and/ or transmitted light? In an essay of the required length, explain the origin of the color you see when you look at the following objects. First introduce the topic of light and color by addressing the issues raised in the guiding questions. Take into account whether the color of these objects involves absorption, reflection, and/or transmission of light. Use the color wheel model in your explanation. ●

a beam of blue light

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a white sheet of paper

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a red shirt

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a black shoe

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a transparent yellow solution

Required Text Entry Length: 200 to 330 words

___ When a light wave with some frequency strikes an object, light can be absorbed, reflected or transmitted. Within the electromagnetic spectrum, humans can only see visible light. This visible light spectrum has wavelengths of 400-700 nanometers, with violet having the lowest and red having the highest wavelength, with various colors in between. The color that we see comes from the light being reflected by the object that's absorbed by our eyes, rather from the object itself. For example, a white piece of paper appears white because it reflects all colors. On the other hand, a black shoe absorbs all wavelengths of the visible light spectrum so no light is emitted and appears therefore black. The color black is a subtractive color on the color wheel, meaning that the color strictly reflects off a surface, and is therefore, not absorbed. A few other examples of light reflections and absorption, respectively, is a red shirt and a beam of blue light. The red shirt appears red because it absorbs all colors of the visible light spectrum except for red, and reflects red. Likewise, the same happens with the beam of blue light, except the subtractive effect occurs where specific wavelengths are absorbed, and the human eye only sees the light that’s reflected off. The color wheel is a good base to start off of when learning about colors combining. For a combination of light colors, additive or subtractive effects take place when the colors are not absorbed. Interestingly enough, when the paint colors red and green are mixed, it forms the color brown. For the mixture of the same colors in the form of light, however, it forms the resultant color, yellow light. This is exactly what causes a transparent yellow solution to appear yellow, from the mixture of these two colors....