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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)
Can anyone explain.. by Dessie1   (Show all posts)
Something in which.. by khkk   (Show all posts)
McCloy. Shome mish.. by Bleck Cra   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 17 Next page >>
Track
Central Dingle Quartet from Anascaul
Bunsen7 a day ago.
Follow the track from Anascaul lake car park northwards up onto the mountain plateau.Track leads northwards from lake... walk, Len: 15.8km, Climb: 949m, Area: Stradbally Mountain, Central Dingle (Ire

  
Summit Summary
Seefin Mountain W Top: Bog and rough ground.
Collaborative entry Last edit by: melohara 3 days ago.
Car park space at R66276 16811. Over or around the gate and head uphill on a good track that crosses the hill near the summit of Seefin Mountain East top.Follow the track on downhill from the cres...

  
Summit Summary
Seefin South-East Top: Seefin South East Top is easily visited
Collaborative entry Last edit by: melohara 3 days ago.
Seefin South East Top is easily visited from the track leading to Seefin Mountain East Top and Seefin Mountain West Top which starts st R66276 16811. Just follow the track to R65202 17892 from whe...

Track
Pic du Midi d'Ossau
David-Guenot 2 days ago.
The idea came from my 60-year-old, freshly retired neighbour, as we and some other members of the local badminton club m walk, Len: 16.2km, Climb: 1353m, Area: France, Nouvelle-Aquitaine ()

  
Summit Comment
Carnaween: The visitors book box near the summit
Aidy a week ago.
Just wanted to show the brilliantly constructed little box which contains the visitors book. It was too wet and windy on my visit to take it out and risk ruining it. A few shafts of light breaking...

  
Summit Summary
Seefin Mountain E Top: Up the old bog road.
Collaborative entry Last edit by: melohara 3 days ago.
Car park space at R66276 16811. Over or around the gate and head uphill on a good track that crosses the hill near the summit.On the crest of the hill the summit cairn is over a wall to your right...

Summit Comment
Carnaween: Bad Weather Adding Drama To Great Views
Aidy a week ago.
I used the commonly taken route from Disert Graveyard (worth a visit in its own right) over ground that was alternatively boggy or pretty steep. It was freezing cold in these parts, with a strong ...

  
Track
Pic Rouge de Bassiès
David-Guenot 3 days ago.
This was the first of the two big hikes I did in the Pyrenees in summer 2016. Hiking in the summer often means a sunny d walk, Len: 16.3km, Climb: 1342m, Area: France, Midi-Pyr?n?es ()

  
Summit Comment
Corrin: A family stroll.
David-Guenot a week ago.
Climbed this hill in November 2014, with a friend who used to live in the area. Starting at the Coillte car park, we did a nice loop on the forest paths, circling around the hill in an anticlockwi...

Summit Comment
Luggala: Fancy View from White Hill
davsheen 2 weeks ago.
Autumn's evening view across to Luggala/Fancy from White Hill on route down from Djouce using the Wicklow Way boardwalk section.

  
Forum: General
MV Mountain Gathering 2017
Onzy 5 days ago.
Always a great night ... all welcome.

  
Summit Comment
Binn Charrach: The peat-hag capital of Connemara
markwallace 2 weeks ago.
The descent from Benbaun to the R344 via Knockpasheemore/Binn Charrach is hard going after a day in the Bens. The Knockpasheemore ridge looks nice and flat from below, but is boggy, undulating and...


RECENT CONTRIBUTIONS 1 2 3 .. 17 Next page >>