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Re: [Phys-l] absorption spectra

What I found fun was comparing the spectrum of sunlight with that of the
fluorescent lights in the classroom -- you can really see the mercury lines
in the fluorescent lights. And if you have a mercury vapor lamp you can
view it and the indoor light at the same time (I just put the mercury lamp
so it lined up with the classroom door opened just a crack and we looked out
of the darkened room into the lit hallway) and convince yourself that it is
really mercury in the fluorescent tube.

I'm not answering the question about absorption spectra, I guess. But when
you don't have the answer it's easiest to change the question.

Steve Highland
Still goofing off in Duluth, MN

Thanks! This could work. I mainly want the students in the darkened
classroom using a grating to look at light sources.

Forum for Physics Educators <> writes:

Have them look at the sky in daylight. But not directly at the sun!
(You knew that bit).


On Wed, Oct 29, 2008 at 9:26 AM, Anthony Lapinski
<> wrote:
In my high school astronomy class, I will be discussing light and
soon. I wish to do a lab/activity where students can analyze various
sources with a diffraction grating. It is easy to show continuous
with a candle or light bulb, and emission spectra with gas tubes. I am
looking for a way to show an absorption spectrum. In the past I had
students use colored filters to cover an incandescent light bulb. This
sort of mimics the atmosphere of a star.

Does anyone have other ways to show absorption spectra using simple

Forum for Physics Educators

Forum for Physics Educators

Forum for Physics Educators