The experimental part
1. Determine graduate graph of monochromator by mercury spectrum. For it you must to revolve the monochromator drum until you can see the spectrum line in micrometer eyepiece.
For mercury lamp:
Colour of spectrum line
Wavelength, 10-9 ,m
Violet
Blue
Light blue
Green
Yellow
410,805
434,749
435,833
491,607
502,564
546,073
578,966
2. Determine the line position of red, green and blue on monochromator drum of hydrogen spectrum.
3. Determine the wave length of red, green and blue lines of hydrogen spectrum used graduate graph of monochromator.
4. Calculate the Rydberg constant by formula
, (11.9)
where λmn is wavelength; n = 2 and m = 3 (red), 4 (dark blue), 5 (light blue), 6 (violet).
6. Put down the date of measurements in the table:
n2
Colour of line
Angle of rotation a monochromator dram
Wavelength, l, nm
Rydberg constant,
R i , m-1
,
m-1
Red
Dark blue
Light blue
Violet
6. Make analysis of the experiment results.
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