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

, (9)

where λ_mn 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,, nm	Rydberg constant, Ri, m^-1	,m^-1
3	Red
4	Dark blue
5	Light blue
6	Violet

6. Make analysis of the experiment results.

Control Questions

1. What is dispersion of light?

2. What is physically meaning of coefficient refraction of light?

3. Formulate Bor's postulates.

4. What is dark-line spectrum and bright-line spectrum, continuous spectrum and discrete spectrum?

Authors: Lushchin S.P., the reader, candidate of physical and mathematical sciences.

Reviewer:

Approved by the chair of physics. Protocol № from 0 . .2009 .