[meteorite-list] Blue sky ? - Explanation

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From: Ed Majden <epmajden_at_meteoritecentral.com>
Date: Thu Apr 22 09:46:23 2004
Message-ID: <3AFDC12C.12A48E6B_at_home.com>

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http://www.why-is-the-sky-blue.org/why-is-the-sky-blue.html

Rather than explain why the sky is blue, I found this page by doing a
quick search of the web!

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<CENTER><H2>Why is the sky blue ?</H2></CENTER>
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<h3>Blue sky: short explanation</h3>

Blue light gets scattered (spread) around much more than all the other colors from the sun, causing the sky to appear blue.

<h3>Blue sky: a more detailed explanation</h3>
Light is made up of electromagnetic waves.

The distance between 2 crests in this wave is called the wavelength.

White light contains all the colors of the rainbow.

All the colors in white light have different wavelengths.

Red light has the longest wavelength.

Red light's wavelength is larger than oxygen atoms are big.

When red light passed through the atmosphere, its long wavelength
causes it to pass through the atmosphere without being scattered/spread around.

Blue light has a much, much shorter wavelength than red light.

The wavelength of blue light is shorther than oxygen atoms are big.

Many of the blue light waves from the sun collide with the oxygen atoms.

When such blue light waves try to go straight through an oxygen
atom, its light is scattered in all directions because of this collision.

This scattered blue light is what makes the sky blue.

All other colors (with longer wavelengths than blue light) are scattered too.

Blue light's short wavelength causes it to be scattered the most.

(The shorther the wavelength of the color, the more that color gets scattered by the atmosphere)

Actually, violet has the shortest wavelength of all colors. Violet is
scattered even more than blue light. However, our eyes are much more
able to see blue than violet, therefore we see the sky as blue.

Very little visible light is absorbed by the atmosphere.

<h3>Blue sky: summary</h3>
Blue light's short wavelength causes it to get scattered around much, much more by oxygen atoms than the longer wavelengths of all other colors visible to us.

The blue in the sky we see is scattered blue light.

<A HREF="./sky-blue-quizzes.html">Take these short online quizzes to test your understanding of this blue sky explanation</A>
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<CENTER>More science quizzes ... <A HREF="http://www.1001-periodic-table-quiz-questions.com/">Over 1000 school science quiz questions</A></CENTER>
<CENTER>Here are over 1000 school science quiz questions for grade 3 to 9 students. 
The quizzes are arranged per grade level and science topic areas.</CENTER>
<CENTER><A HREF="find-out-more.html">Find out more about light, reflection and refraction in encyclopedias</A></CENTER>
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Received on Sat 12 May 2001 07:03:09 PM PDT

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