User:Manuel Franco Jr./Notebook/Physics Lab 307/2008/10/01
|Balmer Series Lab||Main project page|
Previous entry Next entry
The Balmer Series For Hydrogen and Deuterium
Lab Partner: David
The objectives are: calibrate an optical spectrometer using the given mercury spectrum in the lab manual, investigate hydrogen and deuterium, compare them, and determine the Rydberg constant for hydrogen.
We first had to calibrate the spectrometer by using mercury (Hg) and the table spectral lines of Hg (Lab Manual: Section 4.3).
Hg Spectral Lines
404.7 nm (deep violet very hard to see!!) 435.8 nm violet skip (very weak blue-green) 546.1 nm green 577.0 nm yellow 579.0 nm yellow 690.75 nm red
The calibration was repeated as need. The colors were aligned using the cross hairs in the eyepiece. We moved the prism as need. Once we calibrated the spectrometer, we adjusted the slit to .7 mm. We adjusted the slit as needed, but we stayed within the bounds of .5 and 1 mm.
As we were calibrating Koch mention the us that the gears in the dial has what is called "slop." So when we calibrated the spectrometer, we calibrated it going counterclockwise. That means all the data measurements have to be taken the same way. If we were to take a data point clockwise, or opposite to direction we initially used to calibrate, our data would be off by about 1 nm. So all the data was gathered going in a counterclockwise direction on the dial.
This is what you should see.
Data AnalysisSJK 02:17, 22 October 2008 (EDT)
This is the Spread Sheet 1 in where I did all my analysis for hydrogen and deuterium.
As for the Rydberg constant, I found the constant in this word Spread Sheet 2.
I used this equation to find the slope http://upload.wikimedia.org/math/5/a/0/5a05645dc256a0aca0ab1c9cf97b6525.png . And this is the actual measurement thereof http://upload.wikimedia.org/math/7/b/6/7b625152ea50ad187556f8d158b79aff.png .
This is my lab summary.