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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)
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RECENT CONTRIBUTIONS 1 2 3 .. 25 Next page >>
Forum: General
Only 2 weeks to go
liz50 a day ago.
Mountainviews Members Meet on Saturday 7th October will be a hike around the the Corranabinnia/Glendahurk horseshoe in the Nephin Beg mountain range in Co Mayo. If you are interested in joining us...

  
Summit Comment
Westaston Hill: The top?
Barry a day ago.
I think the highest point is likely about 175 metres in a WSW direction from the mast. I'm judging this from aerial photography and DTM which shows a rocky outcrop in a small forest clearing. DTM ...

  
Summit Comment
Barranisky: Barniskea or Barniskey
Barry a day ago.
Might be worth adding that Ballymoyle Hill might be more appropriate name for this height. Called that in Coillte records. Whilst Barranisky is spelt thus on OS six inch maps, note that Hall Nevil...

Track
Wild SE Inishmore
simon3 a day ago.
This is a walk around the SE corner of Inishmore. The weather wasn't great so the photography was a bit limited due to d walk, Len: 12.8km, Climb: 161m, Area: Oile?in ?rann (Ireland)

  
Summit Comment
Gubacarrigan: Coastal Hill
sandman 6 days ago.
Your options for parking are numerous but a lay-by is located at L7648192513. It only takes a few minutes to reach the cliff edge and on to the summit but as evident from the tracts along the edge...

  
Track
Pic d'Anie
David-Guenot 2 days ago.
walk, Len: 16.0km, Climb: 1027m, Area: France, Nouvelle-Aquitaine ()

Summit Comment
Rosgalliv Hill: Coastal Hill
sandman 6 days ago.
For the Mountain View members who will be joining Liz50 for her walk on 7/10/17 why not get there a few minutes earlier in order to visit this small hill with its Megalithic Tomb . Parking is avai...

  
Track
Pic et Lacs d'Ayous
David-Guenot 2 days ago.
walk, Len: 20.2km, Climb: 1113m, Area: France, Nouvelle-Aquitaine ()

  
Forum: General
a man's word
BleckCra 2 days ago.
Aidan thanks. Good to hear from you. There's a kind of accuracy in your translation even although there isn't. Still, it's close and ants aren't.There are essentially 3 titles for hills in Irish.S...

Summit Comment
Rostoohy Hill: Coastal Hill
sandman a week ago.
The summit area with its hill fort and views across the bay.

  
Track
Pic des Trois Seigneurs
David-Guenot 2 days ago.
walk, Len: 9.7km, Climb: 904m, Area: France, Occitanie ()

  
Summit Comment
Rostoohy Hill: Coastal Hill
sandman a week ago.
Parking where appropriate make your way the short distance along the foreshore to L9531390160 where ascent to the hill exists as shown in the photo. You will encounter a small stone drinking well ...


RECENT CONTRIBUTIONS 1 2 3 .. 25 Next page >>