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khkk
2011-08-22 10:53:25
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.
Mountain Rescue Te.. by simon3   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 18 Next page >>
Forum: General
Tough Soles complete a WayWalkers Challenge.
simon3 16 hours ago.
Tough Soles a couple of determined walkers who chose to walk all the waymarked ways in Ireland will be finally finishing on Sunday the 28th of July when they reach the end of the Wicklow Way in Du...

  
Summit Comment
Curracahill: Not great
chelman7 a day ago.
Curracahill is the 633rd highest spot in Ireland. It would be about 633rd on my list of good walks.

  
Summit Comment
Cuilcagh: A classy mountain
hazyview 5 days ago.
I followed the directions (per scarecrow & others) to the second carpark & we commenced the awesome long boardwalk across the bog & up the mountain. A good challenging climb of stairs to the summi...

Summit Comment
Hill of Allen: Pleasant and easy stroll
TommyMc a week ago.
A pleasant and easy stroll from the lay-by on the Allen-Miltown road as referenced by Dessie1. Frustratingly a spacious car parking area at this spot is padlocked, meaning visitors must park in a ...

  
Summit Comment
Largan Hill: Having it Largan
madfrankie a week ago.
In an effort to avoid the unpleasant tree-stuff described previously, I decided to make an alternative approach. At the western end of Lough Talt I took a minor road at G38776815942 that skirts th...

  
Track
Thor's Cave and the Manifold Valley
Peter Walker a week ago.
walk, Len: 17.5km, Climb: 445m, Area: Lancashire, Cheshire & the Southern Penni...

Summit Comment
Inishturk: A quiet place
TommyV a week ago.
Similar to Inis Mean, the middle Aran island, Inis Turk is in the middle of Clare Island and Inis Bofin and is much less visited than it's neighbours. The island itself is very small and can be hi...

  
Track
Buachaille Etive Mor (mostly)
Peter Walker a week ago.
Being sick on your holidays is a classic example of a First World Problem, but it's still pretty annoying. After ... walk, Len: 12.9km, Climb: 972m, Area: Stob Coire Altruim, Loch Linnhe to Loch |...

  
Summit Comment
Knockastia: Most central hill in Ireland??
TommyV a week ago.
Heading North from the little village of Rosemount will bring you near this hill. I found parking beside an old abandoned house at N24222 42974 and proceeded to walk up a road which leads to a hou...

Track
Soum de l'Arraït, Montagne de Lège and Sommet de l'Oudérou from Binos
David-Guenot 4 days ago.
walk, Len: 16.8km, Climb: 1272m, Area: France, Occitanie () ||

  
Track
Meall Fuar-mhonaidh
Peter Walker a week ago.
walk, Len: 9.5km, Climb: 520m, Area: Meall Fuar-mhonaidh, Glen Affric to Glen M...

  
Summit Comment
Cupidstown Hill: One for the County High Pointers only!
TommyV a week ago.
The start point as mentioned by others leads to an easy walk along a forest road for about 500m before reaching the trig point. behind the mast marking the Kildare CHP. The forest trail had lots o...


RECENT CONTRIBUTIONS 1 2 3 .. 18 Next page >>