Do the activity Colors #2 in the manual.
Box:
Here are some pictures of some standard kinds of lights photographed through a diffraction grating (The colors of the spectra don't quite match what you will see -- when we talk about color, it will become clearer how a picture of a spectrum differs from a spectrum -- and width of the spectra also won't match -- but the pattern of bright lines will be the same).
Spectrum and name | Source | Comment |
---|---|---|
Incandescent |
Hot wire glows when electricity
passes through it |
The common light bulb |
Fluorescent |
Mercury vapor light with fluorescent stuff, to make a more balanced
spectrum
Electricity causes gas in tube and coating on tube to glow. |
Color balance somewhat similar to daylight. Much more energy efficient than incandescent. Lighting for schools, stores |
Compact fluorescent |
Different fluorescent stuff, same idea as mercury lamp | Efficient, color balance more similar to daylight. Screw base means it can replace incandescent light bulbs |
Neon discharge |
Similar to mercury, but with a different gas inside | Once very common in advertising signs (bright orange-red) |
In addition to recording your survey of the different kinds of lights you find, you should write a note to yourselves about the experimental problems you may have encountered. Return to the sample page