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| Subject:
Quantum electrodynamics
Category: Miscellaneous Asked by: andy1234567-ga List Price: $2.00 |
Posted:
06 Jan 2005 15:46 PST
Expires: 05 Feb 2005 15:46 PST Question ID: 453201 |
Why is house dust gray? |
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| Subject:
Re: Quantum electrodynamics
From: pinkfreud-ga on 06 Jan 2005 16:05 PST |
Does this help? http://www.madsci.org/posts/archives/oct99/939213604.Ph.r.html |
| Subject:
Re: Quantum electrodynamics
From: guzzi-ga on 06 Jan 2005 18:19 PST |
Definitely related to the ?colour of the universe?, recently determined as beige. How sad. Best |
| Subject:
Re: Quantum electrodynamics
From: andy1234567-ga on 07 Jan 2005 15:27 PST |
For those helping me with the question, "Why is house dust gray?" It has to do with particle size and principles of QED. Surely, someone at Google can get the answer. |
| Subject:
Re: Quantum electrodynamics
From: guzzi-ga on 08 Jan 2005 18:35 PST |
I confess, I can?t make a linear link from house dust colour to QED. The relativistic quantum theory of electromagnetic interactions *is* ultimately invoked but resolves to gaussian macro for such large ?particles? -- does it not? Generally there is little intrinsic colour bias in house dust, a large proportion being composed of human skin. The properties, both in colour and reflectivity, are similar to the 18% grey (gray) used for photographic calibration. There is also scattering to be taken into account, in a similar way that the ?streak? of many a coloured mineral is actually pretty neutral. Best |
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