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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.
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Track
Highwayman A route 2018
jackill 2 hours ago.
Highwayman A - 2018. This years route was slightly less than the 2017 route due to weather conditions. walk, Len: 25.1km, Climb: 580m, Area: Knockshanahullion, Knockmealdown Mountain...

  
Track
Just Dooish !
pazapas 11 hours ago.
?The walk is a simple 24.5km loop all inside Glenveagh National Park. The entrance is free of charge.The route is made walk, Len: 24.5km, Climb: 898m, Area: Donegal NW (Ireland) Crockmulroney, Doo

  
Track
Lough Curra Circuit
Jim Holmes a day ago.
A simple enough route, but very rewarding - from the Cush carpark, head upwards to Lough Curra. Then it's up to the mi... walk, Len: 12.9km, Climb: 1011m, Area: Galtymore, Galty Mountains (Ireland) G

Track
Croghan Kinsella
jgfitz 2 days ago.
This is a variation on track #3938, so I will avoid repeating the comments made there, with which I fully agree. This... walk, Len: 11.4km, Climb: 412m, Area: Croghan Kinsella, Dublin/Wicklow (Irelan

  
Summit Comment
Cnoc na Boirne: Murren.....a little gem.
jsramsey1491 2 days ago.
Last Thursday, 18/10/2018, a few friends and I did a recce on Murren Hill and the surrounding area. We have over the past twenty years or so covered most of the county but this was the first time ...

  
Summit Comment
Slieve Binnian: Mind how you go on a route Not Recommended
Pepe 3 days ago.
Climbed this yesterday on the route leading from Brackenagh Bridge. Chose this route because I wanted to do Moolieve and the Wee Binnian on the way up. On a plus note a local farmer kindly let me ...

Track
Buckaun - Binnaw circuit.
simon3 3 days ago.
Hydro scheme at Lough Nadirkmore.The walk starts from a point high in an east facing coum of Maumtrasna. This road goes walk, Len: 5.8km, Climb: 368m, Area: Partry/Joyce Country (Ireland)

  
Summit Comment
An Bhinn Bhuí: A spectacular landscape
Damian120 3 days ago.
It's a seldom-visited area of County Mayo yet it boasts some of the most impressive coastal architecture in the entire country. After spending five years covering and exploring the landscape of th...

  
Forum: General
THE POWER OF WORDS
Pepe 3 days ago.
There I was scratching around on Slieve Binnian. Up top, I bumped into a couple out hillwalking for the day. Pleasantries were exchanged – which way did you come up, fabulous views, the weather – ...

Track
Knocknalougha South Top
Onzy 4 days ago.
Route to Knocknalougha South Top from Crow Hill carpark ... as outlined by melohara on the Hill Page... walk, Len: 11.7km, Climb: 430m, Area: Knocknalougha South Top, Knockmealdown Mo...

  
Summit Comment
Big Collin: Permission required?
StephenMullin a week ago.
Hi thereCan anybody tell me if permission is required to walk up Big Collin? If so, how does one go about obtaining this?Many thanks!

  
Track
12 (Listed) Bens - Revisited
GSheehy 6 days ago.
I was drawn back by the lure of completing the 2002 - 12 Bens Challenge route. I got the details from John J. Cotter w... walk, Len: 29.1km, Climb: 2598m, Area: Benglenisky, Twelve Bens (Ireland) Ben


RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>