Properties of Light

Danielle Silverstein PHY 101 incision 10497 March 4, 2013 Light up this World Purpose In this research laboratory experiment, direct lights give be used to show how when E&M radiation is absorbed, the energy is converted to horniness. A drop of isopropyl alcoholic beverageic beverage will absorb light energy of different comments, and the dehydration rate of the alcohol will be measu flushed. The key to this lab is the desiccation rate is this instant related to the energy of the light shining on the drop. Materials * * LEDs and circuits (from previous lab) * pipet (or eyedropper) * Rubbing alcohol Index badger * 9-volt battery * Flashlight * stopwatch * Sm wholly unlifelike box (shoe box) Procedures A three-sided enclosure from the cardboard box was made. This created a location for applying light from the LED to the drop of alcohol while minimizing the effect of air currents on the evaporation rate. The eyedropper was used to dedicate a single drop of isopropyl alcohol o n an index card within the enclosure. The same size drop was used each cartridge holder the step was repeated. The time it takes for the drop to evaporate with turn up the LED present was recorded.The tenebrific spot on the card caused by the alcohol was no interminable visible. A flashlight was used to help with the observance of the dark spot. The evaporation time was recorded. The same procedure was repeated for the different colo vehement LEDs everyplace the alcohol drop. The current through each LED and the distance from the LED to the drop of alcohol was the same for each run. The procedure for each color of LED was repeated at least 10 times and an honest time of evaporation for each color was compute. A graph of evaporation time versus frequency of the LED was then made. Data Time it took to teetotal out the drop (minutes) With no light= 10 minutes Red(minutes) Green(minutes) Blue(minutes) 1 443 515 330 2 449 359 314 3 503 455 407 4 523 348 313 5 4 00 426 326 6 504 447 337 7 435 420 325 8 525 354 310 9 430 505 340 10 445 415 356 Frequencies(Hz) 4. 310-14 6. 010-14 6. 6710-14 Average Time(s) 449 428 331 pic Results The results show that red had the lowest frequency and used the least numerate of energy, green was in the middle of the both other colors with a frequency of 6. 10-14 and blue had the superiorest frequency of 6. 6710-14 Conclusion Light is range of the electromagnetic spectrum detectable by the in the altogether human eye. The spectrum also includes radio waves all the way up to da Gamma rays, and light falls about in the middle. Electromagnetic radiation combines both particles and waves in nature. Electromagnetic radiation brook also be exposit in terms of a stream of photons. These atomic number 18 flockless particles traveling with rippled properties at the hasten of light. For example, the changing electric and magnetic fields in space form electromagnetic wav es (Library Thinking Quest). The colors on the spectrum commute from red to purple.The red light has a lower energy than the violet light thats 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 ar inversely proportional, which causes the wavelength to accrue as the color changes from red to violet (Hewitt, pg. 520). Depending on the color of the light, the wavelength can range from 710-5 cm (red) to 410-5 cm (violet), moreover all electromagnetic radiation travels at the speed of light. The frequency of the light, which is the number of wavelengths per seconds is calculated using the equation C=LN. L is the wavelength, N is the frequency, and C is the speed of light (Library Thinking Quest).From the observations collected, the red LED light took the longest to dry the drop of alcohol and the blue dried it the fastest. Since the red light is on the lower end of the electromagnetic spect rum is used the lowest amount of energy. in effect(p) by looking at the brightness of the light, this conclusion was made but reassured after doing near research. The red light was very barren and faint compared to the brightness of the green and the blue. The blue was the brightest of the lights. This light used the more or less energy and is one of the farthest on the spectrum beside violet. Since the frequency of light increases as the color of light moves down the spectrum, the red light has the smallest frequency of 4. 2*10-14, green has middle frequency of 5. 66*10-14 and blue has the largest frequency of 6. 37*10-14. The frequency is at a time proportional to the energy produced by each of the light, which is shown in the graph above. The blue light had the highest frequency and that used the most energy. The red LED used the least amount of energy because it had the lowest frequency. The greater the frequency caused the alcohol to dry faster since it used more heat (ene rgy) at one time. Light energy and frequency are directly related in the real world also. Typically since red lights founder less energy than blues lights, blue objects are said to be hotter.In 1923, American astronomer Edwin Hubble (1889-1953) made an astounding discovery. As Hubble observed, the light waves from irrelevant galaxies are shifted to the red end, and he reasoned that this must mean those galaxies are moving by from the Milky Way. These observations concluded that something that showed red was moving away from its observer. The laws of thermodynamics state that where heat is involved, the movement is always away from an area of high temperature and toward an area of low temperature. Heated molecules that reflect red light are areas that are moving toward an area of low temperature. Molecules of low temperature reflect downhearted or purple light because the tendency of heat is to move toward them.Fire, for example, it lets bump off heat to keep people warm. The co lor of fire is mostly red and orange. These colors are at the lower end of the spectrum of light. The reason why fire is the color red is because red gives off the lowest amount of energy because it has the lowest frequency. Fire can be used in many different ways in the world without using mass amount of energy to heat things up. As mentioned in the lab from finale week, the alligator clips caused a lot of issues with holing the connections together. A better material would be the connection covers where the wires go inside a little tube and are squeezed together at each end to insure security.When the light went out due to the connection, it caused created a longer time for the alcohol drop to dry. This created some error in the experiment with the time and the overall average. picReferences Hewitt, P. G. (1998). Chapter 23,24. Conceptual physics (8th ed. , pp. 494-550). Reading, Mass. Addison Wesley. Lesson 9 Electricity. (n. d. ). PHY 101 . Retrieved February 9, 201328, 2013 , from https//www. riolearn. org/content/phy/phy101/PHY101_INTER_0000_v4/lessons/lesson08. shtml? encrypted-sectionid=am5lN0s1VHdrNkRZdEdaK3ZBR3dSdz09 The Physics of Light What Is Light?. ThinkQuest Library. N. p. , n. d. Web. 19 Mar. 2013.