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Hello Simon,My nam.. by simon3   (Show all posts)
THIS SATURDAY AUGU.. by Bleck Cra   (Show all posts)
I'm speaking at a .. by ahendroff   (Show all posts)
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)
Thought I'd post s.. by paulca   (Show all posts)
found the explanat.. by jackill   (Show all posts)
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RECENT CONTRIBUTIONS 1 2 3 .. 20 Next page >>
Summit Comment
Aughinish: Clare Island
sandman 6 days ago.
This island is located in County Clare but can only be accessed via County Galway. Originally connected to Clare but the connection was lost in 1755 as a result of an earthquake The British built ...

  
Track
Croagh Patrick
Paul_Rooney 18 hours ago.
walk, Len: 7.7km, Climb: 709m, Area: Croagh Patrick, Croagh Patrick (Ireland) C...

  
Track
Near Truskmore, Dartry Mountains (Ireland)
Paul_Rooney 18 hours ago.
walk, Len: 8.5km, Climb: 424m, Area: Truskmore, Dartry Mountains (Ireland) Trus...

Track
Ballyhoura 3 Tops
David-Guenot a day ago.
walk, Len: 6.9km, Climb: 363m, Area: Seefin Mountain E Top, Ballyhoura Mountain...

  
Summit Comment
Binn Mhairg: A well worthwhile but neglected scramble
IainT 6 days ago.
The quartzite slabs on the NE flank of Binn Mhairg make a good scramble, one of the best in the Maum Turks. They are reachable by traversing round from the Mam Ean track, pathless but largely gras...

  
Track
Moanlaur Ridge
David-Guenot a day ago.
walk, Len: 13.6km, Climb: 754m, Area: Lack Mountain, Slieve Mish (Ireland) Lack...

Summit Comment
Scanlan's Island: Clare Island
sandman 6 days ago.
Access to the Island is via the gravel road/track located at M2575111537 .During low tide you have no problem driving on to the island and following the track to the left over concrete to within m...

  
Summit Comment
Lackabane: NE Spur
simon3 4 days ago.
The NE spur off Lackabane is something of a knife edge, descending steeply and with even steeper sides. Watch it on a poor day.

  
Track
Mount Brandon S Ridge from Conor Pass
David-Guenot a day ago.
walk, Len: 22.4km, Climb: 1603m, Area: An Bhinn Dubh, Brandon Group (Ireland) A...

Summit Comment
Munnia Top: Coastal Hill
sandman 6 days ago.
Best to access this hill via the farm gate located on the the coastal side at M2929112163 in order to avoid the houses on the opposite side. Just a quick up and down over grazing land to begin and...

  
Forum: General
Local 100
wwwalker 3 weeks ago.
I just wanted to say well done on the change to the local 100 conditions. I was nearly there but the last 2 or 3 would have involved almost going through peoples gardens etc. so I abandoned trying...

  
Summit Comment
Knockvorneen: Coastal Hill
sandman 6 days ago.
Two 50cent Australian coins forever enjoying the view of Galway Bay.


RECENT CONTRIBUTIONS 1 2 3 .. 20 Next page >>