Lab report 9 - Emission Spectra(Lab#9 Jesse LaSalle TA...

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Emission Spectra (Lab #9) Jesse LaSalle TA: Jimmy Martin Experiment Completed: November 15, 2007 Report Submitted: November 29, 2007
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I) Purpose : Observing spectra of emission from hydrogen and helium, and using these observations to determine transitions of energy responsible for line spectra in hydrogen. II) Procedure : Casey, J. and R. Tatz (2008). Emission Spectra.. General Chemistry Laboratory Experiments , Hayden McNeil. Vol.1: 89-98. III) Data : (See attached report form.) IV) Calculations : Energy of emitted hydrogen photon, color: red. = E hcλ = . - * . . - E 6 26x10 34 2 998x108649 2x10 9 = . - E 3 060x10 19J Energy level transition of red emitted photon. . - = - 9 112x10 8 λ 1nf2 1ni2 . - . - 9 112x10 8649 2x10 9 - = . 1nf2 1ni2 0 1405 This number is close to 0.13889, so the transition can be approximated as an n=3 to n=2 transition. V) Error analysis/Conclusion: This laboratory experiment had very few potential sources of error. When reading the scale measurements for the various lines, it is possible that some had been misread. One line read in the Hydrogen spectra as an 8.7 on the scale.
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