Properties of Light Essay

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Danielle Silverstein PHY 101 Section 10497 March 4, 2013 Light up this World Purpose: In this lab experiment, LED lights will be used to show how when E&M radiation is absorbed, the energy is converted to heat. A drop of isopropyl alcohol will absorb light energy of different colors, and the evaporation rate of the alcohol will be measured. The key to this lab is the evaporation rate is directly related to the energy of the light shining on the drop. Materials: * * LEDs and circuits (from previous lab) * Pipette (or eyedropper) * Rubbing alcohol * Index card * 9-volt battery * Flashlight * Stopwatch * Small cardboard box (shoe box) Procedures: A three-sided enclosure from the cardboard box…show more content…
The spectrum also includes radio waves all the way up to gamma rays, and light falls about in the middle. Electromagnetic radiation combines both particles and waves in nature. Electromagnetic radiation can also be described in terms of a stream of photons. These are massless particles traveling with wavelike properties at the speed of light. For example, the changing electric and magnetic fields in space form electromagnetic waves (Library Thinking Quest). The colors on the spectrum vary from red to violet. The red light has a lower energy than the violet light that’s at the end of the spectrum. The frequency of the light increases as the color of the light changes from red to violet. Wavelength and frequency are inversely proportional, which causes the wavelength to decrease as the color changes from red to violet (Hewitt, pg. 520). Depending
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