Date: Wed, 16 Oct 2002 20:17:11 +0000

Author: "Edward Sabol"

Subject: Re: Candles and Celestial Spheres


Tripennese (spelling?) i will look at mine when I am back at school. Though
it is smaller than requested

>From: Bill McNairy
>Subject: Candles and Celestial Spheres
>Date: Tue, 15 Oct 2002 13:22:57 -0400
>Dear Tappers:
>A two-part question today---
>1. Is the light from a candle flame only from the blackbody emission
>spectrum? Thus, is the blue part of the flame hotter than the yellow part?
> (or as a faculty member stumped me-- Is this part of the flame really
>hotter than our Sun?) Or is there a contribution from emission spectra from
>electron transitions within given types of atoms? Flame viewed through a
>spectroscope with the eye appears to be a continuous spectrum. I know that
>you can use light emission/absorption to fingerprint salts held in the
>flame, but we're trying to figure out the optical properties of the
>original flame first.
>2. Our intro astronomy prof would like a 'celestial sphere' that surrounds
>an Earth globe. We're looking for something of 0.5-1.0 m diameter that
>could be used in the classroom to show the tilt of the Earth's axis and the
>positions of stars above. Any suggestions for quality sources of this at
>reasonable prices?
>Thanks again!
>William W. McNairy, Ph. D.
>Room 104I (919)-660-2689
>Dept. of Physics, Duke University
>Box 90305 Durham, NC 27708

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