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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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Summit Comment
Farbreague: from Arderin
ewen 5 days ago.
Walked to Farbreague from Arderin. There is a track that some kind soul has marked with sticks and ribbon. When I say track, it is really a worn down trough in the bog.The multicoloured pipe at th...

  
Summit Comment
Tonelagee: Fore!!!
ewen 6 days ago.
Did from the Wicklow gap car park following track 2378.This starts immediately opposite the top entrance to the car park next to the main road. 5 days before there had been snow but now the path w...

  
Summit Summary
Robber's Pass Hill: Minor heathery lump. Overcivilised and underwhelming.
Collaborative entry Last edit by: simon3 3 days ago.
This oddly named hill is more a very minor heathery bump incorporated into the system of tracks laid out by the Wicklow Mountains National Park. It can be reached from any of the western car-parks...

Summit Comment
Brandon Hill: Grand on Brandon!
MountainBoy a week ago.
Me and my Dad climbed this from the farm track off the Graiguenamanagh-Instioge road on 26/11/16. Right after we got out of the car, we were faced with the dilemma of whether to go straight ahead ...

  
Summit Comment
Croaghmoyle: Easy walk up to great views
Fergal Meath a week ago.
Low lying cloud/mist/fog discouraged me from putting the effort into going up Nephin today. On the way home I parked at the start of the Croaghmoyle service road and followed it past a wind turbin...

  
Summit Comment
Ben of Howth: Loop walk starting from Howth Harbour
Joshua3 a week ago.
There is a nice loop walking signposted from Howth Harbour taking in the cliff path, summit and going close to the top of the Ben. The Black Linn walk is about 8 km and comfortably completed in un...

Track
Binnian-Lamagan Loop
David-Guenot a week ago.
walk, Len: 23.1km, Climb: 1364m, Area: Wee Binnian, Mourne Mountains (Ireland) ...

  
Forum: General
Slieve Binnian - more track work ?
gernee 5 days ago.
Revisited Slieve Binnian for the first time in years on Friday - frost underfoot, blue skies and rolling mist contributed to a great walk, despite disappointment at seeing some of the track work u...

  
User profile
ewen
ewen 5 days ago.
Now living furth of Scotland and getting to know the Irish hills. If you come across a Scottish hill Walker with dodgy knees and walking sedately, stop and say hello.

Track
Spelga Loop
David-Guenot a week ago.
walk, Len: 12.7km, Climb: 739m, Area: Pigeon Rock Mountain, Mourne Mountains (I...

  
Summit Comment
Carrigroe: Sea of cloud
Kennyj a week ago.
Unusual low cloud today heading towards Carrigroe

  
Track
Donard-Commedagh ridge walk
David-Guenot a week ago.
walk, Len: 14.6km, Climb: 1160m, Area: Slieve Donard, Mourne Mountains (Ireland...


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