 |
|
|
You will use your spectrometer to study the light from different discharge tubes (Hydrogen, Helium, Mercury) and a laser. With each source, record the wavelengths of the emission lines. Use the available color felt pens to draw the spectral lines on diagrams like the one shown below.
1. Observe the spectrum from each tube and sketch the pattern of lines observed, remembering that each contains a distinct gas and thus has a distinct spectrum.
2. Predict what you expect to see if you look through your spectrometer at a red laser spot on the wall. Now observe the spectrum of a laser that has been specially setup. The laser beam has been expanded and diffused to make it safe to look at (looking directly into a laser beam would cause permanent eye damage).
3. Observe the spectrum of the overhead fluorescent lights and the compact fluorescent bulb on your bench. The fluorescent coating of the bulb produces a continuous spectrum, but you should also see an emission line spectrum superimposed on it, due to the excited gas in the glass tube. Record the lines observed.
Is this line spectrum of the fluorescent light the same as one of the discharge spectrums that you have already observed? What element do you conclude must be in the tube of the fluorescent light?
Template to record emission lines on
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||