Lab 5_Group_3_Terpsichore_Lindeman_Tuoxin_Cao.draft

Lab 5_Group_3_Terpsichore_Lindeman_Tuoxin_Cao.draft - Jul....

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Unformatted text preview: Jul. 27 Experiment #:5 FINAL Date performed: Monday , July 27, 2009 Diffraction Group 3 Principal investigator: Terpsichore Lindeman tmli222@uky.edu Skeptic & Researcher: Tuoxin Cao tcao2@uky.edu TA Zheng Zhu, Kreswell Neely Role I DC AD RC Q1 Q2 PI PG I introduction DC data and calculation AD analysis and discussion RC results and conclusion Q1/Q2 quiz/prelab Diffraction PI principal investigator points PG personal grade Diffraction Interference Properties of Diffraction Gratings Diffraction is a property of waves that permits them to bend or turn corners. Terpsichore Lindeman Tuoxin Cao 7/27/2009 Diffraction Table of Contents Introduction Firstly, it should be noted that this laboratory exercise is to introduce oneself with a very important technique used in astronomy and that is using the assistance of grating spectrograph to identify the elements that compose heavenly bodies. Diffraction gratings are quite beneficial and extensively used in spectrometry. When a light is incident on a grating of known spacing (100lines per mm , 300 lines per mm etc), it is dispersed into a spectrum. A spectrum is defined as a an assortment of units, which can be anything from particles, to mass units, to light waves that are structured in juxtaposition of value or magnitude of a common physical property they share such as mass, wavelength etc. This laboratory experiment was split into two parts. In part A we examined how indeed when knowing the distance of each bright fringe projected on a screen for every order either left or right of the point m0 , and the distance of the grating and the screen where the light is being projected to, allow us in turn to determine the diffraction gratings lines per unit of measurement. In turn upon completion of Part A of the experiment we were able to we acknowledge how diffraction grating allows one to magnify a light wave. In part B of this laboratory experiment with the assistance of diffraction grating and a digital spectrometer we were able to identify an unknown source of light emitted from a spectrum tube. A spectral tube is actually a glass tube filled with gas intended to provide a continuous source of light . This gas is either an element or a small molecule or compound that when an electrical surge is passing through the tube, it excites the electrons in the gas to get excited which in turn when they begin to relax emit light. The light that they emit is unique for each gas in a spectrum tube! The spectrum tube emitted a continuous light which was of a specific color to the gas element within it. During this part of the experiment when looking at the light through a spectroscope upon it passing through the diffraction grating of 300 lines per mm in order to magnify it, we observed a distinctive set of spectral lines for our unknown source of light which is distinct and unique to the element it was composed of. It is mentionable to say that Kirchhoff not only spoke of theory in circuits but also of spectrum and stated three basic rules on how they are...
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This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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Lab 5_Group_3_Terpsichore_Lindeman_Tuoxin_Cao.draft - Jul....

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