Title: Atomic Hydrogen Spectrum Lab
Date: 8/31/09
Purpose: To observe the emission spectra of
hydrogen and two other gases.
Materials: Spectroscope, power supply, gas tubes.
Research Question: Do all the gas tubes have the
same spectrum?
Hypothesis:
Procedure: Calibration of spectroscope
1. Place the slit opening of your spectroscope
close to the Helium discharge lamp, as
directed by your instructor.
2. Adjust the slit of the spectroscope so that
seven lines are visible.
3. Record the scale readings for all the visible
lines on the data sheet.
4. Make a scatter plot of wavelength versus
scale reading.
Emission spectrum of Hydrogen
1. Move your spectroscope to a hydrogen
discharge lamp.
2. Adjust the slit of the spectroscope so that
three intense lines are visible.
3. Record the scale readings for all the visible
lines on the data sheet.
Note: a faint line at 410 nm may not be visible.
Data: Calibration of wavelength scale with
Helium emission lines
Line
Color
Wavelength Scale
(nm)
Reading
1
Red
707
2
Red
668
3
Yellow
558
4
Light
501
green
5
Darker
492
green
6
Blue471
green
7
Blue447
violet
DRAW A SCATTER PLOT OF HELIUM DATA
WITH A REGRESSION LINE.
Hydrogen Emission Lines
Line
Color
Scale
Wavelength(nm)
Reading
1
2
3
4
410
USE THE SCATTER PLOT TO
DETERMINE Wavelength(nm) DATA.
______________________ Emission Lines
Line
Color
Scale
Wavelength(nm)
Reading
1
2
3
4
Conclusions: