The Hydrogen Atomic Spectrum

Proceed to a station with a hydrogen discharge tube in the power supply. Look at the hydrogen discharge tube with your spectroscope just as you did for the helium discharge tube. Again, although both group members should view the spectrum, only one should take data in order to be consistent. Make sure that your eye position is consistent relative to the eyepiece.

Describe what you see in the spectroscope. Include the number of lines, the color and the wavelength of each line. The fourth line for hydrogen may or may not be visible; its actual wavelength is 4104 Angstroms. Record the experimental wavelength for the fourth line if it is visible.

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