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by: Carmela Kilback
Carmela Kilback
GPA 3.92


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Class Notes
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This 3 page Class Notes was uploaded by Carmela Kilback on Wednesday September 9, 2015. The Class Notes belongs to CHEM 155 at University of Washington taught by Staff in Fall. Since its upload, it has received 11 views. For similar materials see /class/192610/chem-155-university-of-washington in Chemistry at University of Washington.


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Date Created: 09/09/15
Some Ideas for Interesting Seminars to Attend Professor Mark Oberle International Health UW School of Medicine Tsunami disaster in SE Asia Mary Gates Hall 389 but may be changed to a larger room 500PM Tuesday Jan 11th 2005 Notes Dr Oberle was in Indonesia when the tsunami hit This talk is sponsored by the UW PreMedicine Honor Society They will probably ask for donations for the tsunami victims after the talk but you are NOT required to give a donation Ernest Davidson UW Chemistry quotComputation as a Route to Progress in Chemistryquot Friday January 21st 2005 UW Science Forum Series Physics Astronomy Building Room A102 330 pm Reception afterwards Oren Etzioni UW Computer Science and Engineering quotGoogle and Beyond The Future of Web Searchquot Friday February 18th 2005 UW Science Forum Series Physics Astronomy Building Room A102 330 pm Reception afterwards Valerie Daggett UW Medicinal Chemistry quotUsing Realistic Computer Simulations to Address Biological Problemsquot Friday March 4th 2005 UW Science Forum Series Physics Astronomy Building Room A102 330 pm Reception afterwards QUANTUM MECHANICS AND ATOMIC STRUCTURE Work with a partner Lab reports will be due at 500 PM Monday March 14 in Professor Keller s campus mail box The Purpose of this lab is to 1 Understand how gratings are used to measure electromagnetic radiation and determine the grating constant linesmm of a replica grating 2 Understand the design calibration and operation of a grating spectroscope using the known wavelengths of mercury spectral lines 3 Use the grating spectrascope to test Bohr s model of the hydrogen atom for measuring the Ryderg constant and predicting the Balmer series of emission lines 4 Record the emission spectra color and DisplacementD of a number of metal ions then use this information to identify the components of an unknown mixture 5 Apply the particle in a box model to predict the maximum absorbance wavelengths in the visible region of molecules containing delocalized pi electrons I Electromagnetic Radiation Diffraction and the Grating Issac Newton deduced that a beam of sunlight passing through a prism was separated into its component colors We now know that each color component of the beam matches a certain wavelength of light Prisms are generally used to illustrate this process because of their apparent simplicity but a far superior way to separate light according to its wavelength is to use a grating Gratings are surfaces at curved transparent or solid that have many closelyspaced lines or grooves embossed on them Phonograph records and CDs are everyday examples of gratings The behavior of light when it strikes a grating can be understood in terms of constructive and destructive interference in analogy to what happens when water waves pass through a pier see gure In fact the behavior of light when it strikes a grating is the prima evidence we have that light exhibits wavelike properties Figure 1 below shows what happens when water waves pass through or are re ected from a surface containing many regularly spaced openings As you can see the incoming wave breaks up into many little wavelets this is the key idea whose crests and troughs reinforce each other only in certain directions From a distance what one sees is a single incoming wave striking the grating and then going off in a small number of diffracted waves at angles given by the diffraction equation


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