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Introduction Electromagnetic waves cover a huge range of frequencies, from high-frequency gamma rays and x-rays, to ultraviolet light, visible light, and infrared light, and into microwaves and radio waves. Light that is absorbed by an object is usually converted into heat energy.
The absorption of light involves an interaction between photons and electrons. In the process, they re-emit the energy as infrared photons which are invisible to our eyes, but can be detected as heat, and measured with an infrared thermometer.
Methodology Prepare the following materials:
scissors 1. Cut the colored papers into small 3 x 3 inch squares and taped them on the Styrofoam.
2. Let the set of colored paper be exposed to sunlight for 30 minutes and measure the temperature in each of the color every 5 minutes using a thermocouple.
3. Record every temperature measurement Results and Discussion Table 1. Temperature of the colored papers per time interval Table 2. Summarized data calculated from the experiment Table 3. calculated energy density of each colored paper observed Conclusion It is inferred from the experiment that the shorter the wavelength, the higher the energy will the object absorb.
Outside the color spectrum, it is also observed and concluded that black has higher energy absorption capacity than violet, and this is because of the blackbody radiation. It is expected to have a higher energy because it absorbs all the wavelengths of thermal radiation incident on it, that is why it appears to be darker than the colors present in the spectrum.
Energy density depends only on the temperature of the body, it is directly proportional to temperature and inversely proportional to the wavelength of the color an object possesses.
Sources of Error The inconsistency in experimental results, such as Red and Orange having a higher energy density than Yellow and Yellow-Green may be attributed to the following:
1) Inconsistency of the sunlight intensity
2) Changing environment temperature
3) Quick diminishing of the temperature of the papers shortly after they have been taken away from sunlight exposure
It is also important to note that infrared thermometer would have been more efficient than the thermocouple, as the sensor tip of the latter may not have been able to accurately acquire the temperature of the materials due to limited contact between the sensor and the paper
References “Absorption of Radiant Energy by different colors”. Online. http://www.sciencebuddies.org/science-fair-projects/project_ideas/Phys_p073.shtml#background. (accessed February 19, 2013)
“Science Projects on the Effect of Color on Heat Absorption” eHow.com. Online. http://www.ehow.com/info_8 118565_science-effect-color-heat-absorption.html#ixzz2LNKEjJ8V. (accessed February 19, 2013).
“Wavelength vs. Color”. Online. http://pages.cs.wisc.edu/~yetkin/code/wavelength_to_rgb/wavelength.html. (accessed February 19, 2013).
“Radiation Energy Density” Online. http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/raddens.html#c1 (accessed February 19, 2013).
Young, Freedman and Ford, University Physics With Modern Physics, Chapter 17, Pearson Education South Asia Pte Ltd., Singapore City, 2008.
End. Thank You.
- Aldovino. Datu. Lumapas. Morillo Stefan-Boltzmann