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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)
Can give no assist.. by Conor74   (Show all posts)
On the top of Stum.. by simon3   (Show all posts)
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RECENT CONTRIBUTIONS 1 2 3 .. 18 Next page >>
User profile
HoschIchenheim
HoschIchenheim 3 hours ago.
I'm a Hillwalker from the South-West of Germany near the French town of Strasbourg. I'm mainly walking in the Alps, Vosges and Black Forest mountains. So far on two occasions I have been to Kerry,...

  
Forum: General
Feeling Blue
mcrtchly 5 hours ago.
This is one of the most famous mountain views in Norway of the fishing village of Hamn°y, Lofoten islands with Fellshelltinden mountain (428m) in the background. The rust red cottages are old fish...

  
Summit Comment
Knocknacusha: Nice end to a day out.
muddyboots 23 hours ago.
Similar to the other contributors, this is not a single summit day out. I did it after Colly. It's an hour or so with a coffee break. Start at the Ballaghasheen pass (spectacular drive in & out) a...

Summit Comment
Meenteog South-East Top: Really...when is a mountain a mountain
muddyboots 23 hours ago.
I am sure like many of you, especially simoburn, that the addition of the Arderin Begs while technically needed, added loads more summits to climb. This one is, well, a real hard sell. I was tryin...

  
Summit Comment
Colly: Double entendre?
muddyboots 23 hours ago.
This is a great quick summit- follow the farm track from the end of the road at Coomnaspeara. I met 2 farmers (one on the way up and the other on the descent. There are 2 farmhouses at the end of ...

  
Track
Keeper Hill from Silvermines (Knockanroe Carpark)
caseyc481 2 days ago.
Wanted to climb Keeper Hill from the Silvermines side. Parked at Knockanroe carpark, walking downhill on fire road unt... walk, Len: 14.9km, Climb: 763m, Area: Keeper Hill, Shannon (Ireland) Keeper H

Summit Comment
Shehy More: Try a new approach
muddyboots a day ago.
A nice 2 hour 7.5km loop including Shehy More and Loch na mBreac Dearg. The loop starts at W13435 60417 (room 2 cars) and follows a farm track up onto Shehy More. Also for those including Shehy Be...

  
Forum: General
MountainViews Gathering 2017
simon3 3 days ago.
The event on Feb 17, 2017 had Peter Walker as MC with two main speakers.Gareth McCormack spoke about the vision and technicalities of modern landscape photography.Paul Clements discussed the Wild ...

  
Summit Comment
Meenavally: A pleasant walk to theTower
BigFly 4 days ago.
Lovely pleasant walk

Summit Comment
Two Rock Mountain: Red Grouse near the summit.
BarnaneGoat 2 weeks ago.
I climbed here a few days ago from the east along the Dublin Mountains Way. The summit was shrouded in mist and we went astray at one point. I later discovered this was the result of a way marker ...

  
Summit Comment
Sgurr a'Choire Riabhaich: If Allt a' Choire Charnaig in spate there's a small
melohara 2 weeks ago.
If the Allt a' Choire Charnaig is in spate there is a small footbridge, wires and planks, a little upstream

  
Summit Comment
Sgurr Thuilm: If Allt a' Choire Charnaig in spate there's a small footbridge u
melohara 2 weeks ago.
If the Allt a' Choire Charnaig is in spate there is a small footbridge, wires and planks, a little upstream


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