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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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Track
Shefy Knockboy |
Ulsterpooka 13 hours ago.
walk, Len: 39.0km, Climb: 1287m, Area: Lackabaun, Shehy/Knockboy (Ireland) Lack... |
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Forum: General
MOUNTAINVIEWS MEMBERS MEET APRIL 2018 |
liz50 2 days ago.
It is this Saturday 28th April! Visiting some of the lesser know summits in the Galtees, including Temple Hill and Lyracappal. If you would like to join us please contact Liz at elizabethashton201... |
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Summit Comment
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Track
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derkelly274 3 days ago.
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Track
Camenabologue SE |
Bunsen7 5 days ago.
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Forum: General
An Alp for OAPs... |
Colin Murphy a week ago.
If you an ageing hillwalker like myself who might have liked to bag an ‘Alp’ but are too long in the tooth to contemplate such an adventure, fear not, there is a simple little Austrian Alp you can... |
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Summit Comment
Bealick: Between two counties |
Wilderness 3 days ago.
I approached this mountain from the North East ,coming from the Coomataggart mountains. When I got to the top I had to walk around for a few minutes to pinpoint the true summit; which I'm sure is... |
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Track
Mullaghcleevaun circuit |
osullivanm 5 days ago.
A very pleasant circuit although some difficult ground between Duff Hill and the return to start of hike. walk, Len: 17.3km, Climb: 792m, Area: Black Hill, Dublin/Wicklow (Ireland) Blac... |
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