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Q: Vacuum UV in Air ( No Answer,   1 Comment )
Subject: Vacuum UV in Air
Category: Science > Physics
Asked by: mahdi1111-ga
List Price: $2.00
Posted: 14 May 2006 09:35 PDT
Expires: 13 Jun 2006 09:35 PDT
Question ID: 728697
which thickness of ordinary air can block every intensity of Vacuum UV
(10~200 nm)? (with method of calculating and reference for furmulas
and constants used)
There is no answer at this time.

Subject: Re: Vacuum UV in Air
From: neilzero-ga on 14 May 2006 19:47 PDT
My guess is a rare photon of 200 nanometers wave length makes it all
the way to Sealevel. The thickness of Earth's atmosphere is about 100
miles = 170 kilometers, but somewhat more is occasionally quoted, and
a few would argue as thick a 1000 kilometers, as there are still
thousands of particles per cubic meter at an altitude of 1000
kilometers. The thickness increases when CMEs = coronal mass ejections
hit Earth.  Neil

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