Physics307L F08:People/Trujillo/LAB NOTEBOOK/071121

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CALIBRATION

We used Mercury to calibrate** Tomas helped me understand why exactly why calibration was important. It was easier to realize what was going on once we put all the numbers in Excel.

We measured the wavelength with the cross hairs as close to the center of the slit as possible rotating the knob clockwise.

calibration data
coloractual wavelengthmeasured wavelength
red690.75nm634nm
yellow579nm545nm
yellow577nm542nm
green546.1nm525nm
violet435.8nm422nm

With help from Excel, the calibration curve gives. real\,wavelength=1.204205321\times measured\,value-76.8339591

Hydrogen Sepctrum

Hydrogen spectum measurements and rough calculations
colorMeasured ValueActual Wavelength (nm)Actual Wavelength (m)1/wavelengthn2 − 2n − 2Rydberg Constant
red 604 650.5060546 6.50506E-07 1537264.708 3 0.138888889 1.1068306E+07
blue green 466.5 484.927823 4.84928E-07 2062162.558 4 0.1875 1.0998200E+07
violet 421 430.1364809 4.30136E-07 2324843.496 5 0.21 1.1070683E+07
faint violet 400.2 405.0890102 4.05089E-07 2468593.259 6 0.222222222 1.1108670E+07

Rydberg Constant=1.1061 * 10 − 7 STDV 4.6 * 10 − 10

CALCULATIONS

Below is our Excel file:

Image:L and T Balmer series.xlsx Section above has numbers from the excel file.

Data Analysis

Linefit says the calibration data fits the line actual\,wavelength=(1.204205 \pm 0.042636)*measured\,wavelength-(76.833959 \pm 22.932003)nm.

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