GRR..Stupid chem lab question

Are you given a Fraunhofer spectrum to look at? If you are, then pick out the three thickest lines. If there's multiple thick lines just pick three.

If you're not given a spectrum, then here's what I would use based on my searches:
Visible Fraunhofer spectrum - http://en.wikipedia.org/w/index.php?titl...svg&page=1
From this I would say D, E, and F are the most intense lines. Or at least they appear in the regions with the most contrast.

Wavelength vs. Intensity ("strength") graph - http://en.wikipedia.org/w/index.php?titl...svg&page=1
D, E, and F again show the most intensity of the labeled peaks.
EDIT: turns out intensity refers to the intensity of the sunlight and not the actual line absorptions. If you're not given a spectrum of your own then I would just ignore this tidbit because you shouldn't be expected to know this without reference material.

From here I would use a reference chart for what elements produce what wavelength, as found here - http://en.wikipedia.org/wiki/Fraunhofer_lines
Note that several elements contribute to both the D and E lines.

Thanks! Loads of useful information. We weren't given a spectrum, just an fyi. We made our own spectrometers in lab and had to take it home to do some homework questions and one of the questions was to use the spectrometer to view a reflection of sunlight, and find the strongest fraunhofer lines. Dumb question, right? Oh well, the assignment is already turned in.