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 Subject: Why is the sky blue? Category: Business and Money > Consulting Asked by: birdie List Price: \$5.00 Posted: 09 Apr 2002 23:47 PDT Expires: 16 Apr 2002 23:47 PDT Question ID: 2
 Why is the sky blue?
 Subject: Re: Why is the sky blue? Answered By: var-ga on 10 Apr 2002 12:38 PDT
 Light from the Sun (white light) is made up of many colours - red, green, blue, and so on. Each of these colours has a different wavelength and frequency. When light reaches the atmosphere it hits gas molecules which scatter the light in all directions. This scattering is called Rayleigh scattering after Lord Rayleigh who worked out the mathematical equations to describe it. So how does Rayleigh scattering work? Rayleigh scattering only happens when the molecules of gas encountered by the light waves are small compared to the wavelength of the light. What’s strange about Rayleigh scattering is that not all of the light is scattered evenly. Some wavelengths are scattered more. With white light, mostly the light of shorter wavelengths (the blue end of the visible range) is scattered whilst the longer wavelengths (the red end) are mostly uneffected. This means the blue light is scattered more than the red. But violet light has the shortest wavelength so why isn’t the sky violet? Well it’s true that the violet light is scattered more than the blue light, but our eyes aren’t so good at picking up violet light. This means we see the sky as being blue even though there is some violet light there too. The above information was taken from these sources: (http://www.sciencenet.org.uk/database/Physics/Original/p00125d.html) and, (http://groups.google.com/groups?q=why+is+sky+blue% 3F&hl=en&selm=33C461D4.24E0B9%40flash.net&rnum=9)
 Subject: Re: Why is the sky blue? From: weblantern-ga on 19 Apr 2002 09:25 PDT
 And another web site touching on the phenomena is the eponymous http://www.why-is-the-sky- blue.org/.
 Subject: Re: Why is the sky blue? From: fj-ga on 07 Jul 2002 04:32 PDT
 http://www.sciencemadesimple.com/sky_blue.html is another reference. Also, congratulations on posting the very first GA question - a piece of net history!
 Subject: Re: Why is the sky blue? From: fj-ga on 21 Oct 2002 09:36 PDT
 shocking I know, but I couldn't stop myself from posting a comment to the ID2 question - my personal stake for perpetuity...!
 Subject: Re: Why is the sky blue? From: legolas-ga on 12 Nov 2002 08:41 PST
 Whoo hoo! Almost first post! Couldn't resist.. SORRY!
 Subject: Is the Sky REALLY Blue? From: probonopublico-ga on 27 Apr 2004 11:09 PDT
 Yes ... But what ever happened to Birdie? He/she failed to rate the Answer; he/she never asked another Question; he/she is the only user to my knowledge who has never had a GA behind his/her handle. There is more to this than meets the eye which makes me wonder ... Is the Sky really Blue?
 Subject: Re: Why is the sky blue? From: fp-ga on 27 Apr 2004 11:32 PDT
 Subject: Re: Why is the sky blue? From: pinkfreud-ga on 27 Apr 2004 11:36 PDT
 I'd think that if anyone would know why the sky is blue, a birdie would know.
 Subject: Re: Why is the sky blue? From: probonopublico-ga on 27 Apr 2004 12:05 PDT
 You are absolutely right, Pink! Why would a Birdie ask such a question in the first place? Curiouser and curiouser ...
 Subject: Re: Why is the sky blue? From: probonopublico-ga on 27 Apr 2004 12:08 PDT
 Yes, Freddy ... But that was Birdie-GA, and this is Birdie zonder GA. Well spotted all the smae!
 Subject: Re: Why is the sky blue? From: bathrocks-ga on 05 May 2004 07:43 PDT
 Ah, finally found it!
 Subject: Re: Why is the sky blue? From: bathrocks-ga on 05 May 2004 07:47 PDT
 The question I mean - not birdie, sorry :-)