We only know her as "Madeline" and here's the research that she posted on the bulletin board at Color Matters, January, Question Does the amount of thermal energy heat produced by a colored fabric after 30 minutes of intense light relate to its position in the spectrum?
Hypothesis When a color colored fabric absorbs light, it turns the light into thermal energy heat. The more light a color absorbs, the more thermal energy it produces.
Black fabric absorbs all colors of light and is therefore warmer than white fabric which reflects all colors. I predict that the colors of the spectrum appearing the darkest and most like black violet, indigo, and forest green will produce the most thermal energy.
The other colors red, orange, and yellow , will produce the least thermal energy because they appear lighter or more like white. Materials 1. A halogen bulb is a good choice because it has a high light intensity and its light spectrum is very similar to sunlight. Tape the thermometer in the center of the cardboard. Turn the lamp on. Wait 30 minutes, then record the temperature under the cloth. Turn the light off and take the cloth off the cardboard.
Repeat steps 3 through 8 using each of the other colors of cloths. Orange, yellow, forest green, indigo, violet. Repeat the experiment at least 6 times and calculate the average temperatures for each color. Conclusion My hypothesis is correct. The darker colors forest green, indigo, violet produced the most thermal energy after 30 minutes of intense light.
The lighter colors red, orange, yellow produced smaller amounts of thermal energy. Interestingly, the temperatures of the fabrics fell in to two groups instead of increasing as the colors got closer to violet. Keep the thermometer at the same height with respect to the jar lid for all of the tests. Note the starting temperature for each jar. Next, set up your heat lamp in a convenient location, so that it can shine directly at the side of a jar placed between 15—30 cm away.
Decide on an exact distance, and use it for all of the tests. Set the jar to be tested at the correct distance, centered in front of the heat lamp. Leave the jar in front of the lamp for a set amount of time e. Be sure to make the time interval long enough so that there is a measurable increase in temperature. Be sure to use the same time interval for each jar. Repeat until all of the jars have been tested. You should do at least three separate trials for each color, with each trial starting with water at room temperature.
It may take more than one day to do your measurements, so plan ahead! Analyze your results. What was the average increase in temperature for each color? Make a bar graph to show your results, ordering the colors from lowest to highest temperature increase. How does the arrangement of the colors in your bar graph compare to the spectrum of incandescent light?
Energy Engineer. Log in to add favorite More Menu Read More. Variations Compare temperatures of the jars when exposed to sunlight instead of incandescent light.
You'll need a separate thermometer for each jar, and a location where all of the jars receive the same amount of sunlight for a defined time period. As in the experiment described above, you should conduct at least three separate trials. How does the spectrum of sunlight compare to the spectrum of incandescent light?
Are the results of your experiment the same or different with sunlight compared to incandescent light? Ask an Expert The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources.
If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot. Explore Our Science Videos. Overall, how would you rate the quality of this project? What is your enthusiasm for science after doing your project? Compared to a typical science class, please tell us how much you learned doing this project.
Using the same film, the clown on the left Figure 3 a was photographed indoors under tungsten illumination. Note that all hues are shifted to lower wavelengths and the overall image has a definite yellow cast.
The clown on the right Figure 3 c was photographed under natural sunlight, but this time the film was tungsten-balanced K Fujichrome 64T. Under these conditions, the image has an overall blue cast and appears very unnatural. By carefully coordinating lighting conditions with film emulsion, most photographers can easily take beautiful images that accurately reproduce the actual colors of the subject.
Color Temperature - For a more detailed treatment of color temperature visit the corresponding article in our section on photomicrography.
Mortimer Abramowitz - Olympus America, Inc. Michael W. Color Temperature. Color Temperature Explore how color temperature is affected by changes in the temperature of a black body radiator. All of the liquids increased in heat, thanks to their exposure to the sun. But the red, yellow, and clear jars were not quite as hot as the blue and green jars. This was the opposite of what the kids had predicted, as they assumed that blue and green would keep the liquid the coolest.
The color of a liquid can affect its temperature. This is because different colors reflect or absorb different parts of the light spectrum. This happens because cool colors like blue, green, and purple absorb the infrared side of the light spectrum and reflect the cool side of the light spectrum back. This means they retain more heat than red, orange, and yellow, which reflect the warmer light and absorbs the part of the light spectrum that is less hot.
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