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khkk
2011-08-22 10:53:25
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Lasers in the mist
Interesting account of light scattering in mist. Readers of MV will be aware, of course, that although Lord Rayleigh first measured the phenomenon, it was ' In 1859 John Tyndall discovered that when light passes through a clear fluid holding small particles in suspension, the shorter blue wavelengths are scattered more strongly than the red (as in the demonstration above). Later John William Strutt, 3rd Baron Rayleigh, developed equations which approximately describe the behavior of light scattered by small particles and molecules, objects with dimensions much smaller than the wavelength of the radiation in question. Rayleigh's equations predict scattering in terms of the object's size relative to the light's wavelength, and the object's refractive index.'
Check out: http://sxxz.blogspot.com/2007/11/why-is-sky-blue.html
or http://tyndallmountainclub.blogspot.com/ , the site of Kilkenny's Tyndall Mountain Club, which was named to comemorate that illustrious mountaineer & scientist. |
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RECENT CONTRIBUTIONS ..
Summit Comment
Dromderalough NE Top: Odd-looking formations |
Colin Murphy 7 hours ago.
On my approach to the summit I came across a large field of hundreds of these rather striking formations, which I think are are moss-covered boulders, but which looked like giant green ant-hills o... |
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Summit Summary
Dromderalough NE Top: Long route from the south. |
 Collaborative entry Last edit by: Colin Murphy 7 hours ago.
Not normally done in isolation, this top usually forms part of a walk involving Dromderalough itself or Mangerton. One approach is from the north, which has the advantage of a gently rising track ... |
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Forum: General
The Spine Race |
IainT 11 hours ago.
The Spine Race is a 268 mile run up the Pennine Way in N England, run every January, often in vile conditions. Runners are unsupported but there are a few checkpoints where they can sleep or eat. ... |
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Summit Comment
Mullaghdoo: Winter has arrived in the Sperrins |
eamonoc 22 hours ago.
Visited Mullaghdoo today, as part of a 16.4km tek over the Mullaghs, followed Onzy`s track 2570 and added on the walk out to Mullaghdoo and back from Mullaghclogha, much retracing of steps require... |
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Track
Knocksink Wood to Glencullen and Stepaside |
jgfitz 23 hours ago.
Knocksink Wood on the outskirts of Enniskerry is a lovely nature reserve. After an easy 2 km hiking, the remaining 2 km walk, Len: 14.3km, Climb: 578m, Area: Dublin/Wicklow (Ireland) |
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Summit Comment
Slievenaglogh: Pleasant 90 Minute Stroll |
Pepe 3 days ago.
A blanket of cloud covered the higher Cooleys from Foxe's Rock to Foye but Slievenagloch was in the clear - happy days! Lots of logging activity at 9.30 of a Monday morning, so no space to park at... |
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Summit Comment
Mangerton: The Lake District |
TommyV 4 days ago.
Scapania's directions to the start are perfect. It's possible to make a looped walked taking in Stoompa and Mangerton which will allow for great views of so many lakes I won't list them. It's a fa... |
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Summit Comment
Naweeloge Top: Meh |
magnumpig 4 days ago.
I followed Sandmans instructions - thanks for those - it's a bit of a time consuming and boring climb, and the views from the top arent great. I wouldnt prioritise it if you have time constraints ... |
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RECENT CONTRIBUTIONS ..
