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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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RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>
Summit Comment
An Bhinn Bhuí: Benwee Head Loop.
sandman 20 hours ago.
As already stated Benwee Head has some of the most dramatic costal scenery in Ireland and with this in mind i decided to enjoy on a clear sunny day the joys of walking the 12.4km of the Benwee Hea...

  
Track
Meelin Hill, Brackloon and Knockafeehane
Bunsen7 22 hours ago.
A grand and simple waymarked trail for a day of low lying cloud.Park up at the post office beside the Tom Crean mini-p... walk, Len: 7.2km, Climb: 343m, Area: Knockafeehane, Slieve Mish (Ireland) Kno

  
Summit Comment
Knocknanacree: Storm Beach and Cliffs at lower western reaches
Bunsen7 22 hours ago.
A view of "Acres" from Minard Beach. This is apparently a geologically interesting spot in itself as it is a storm beach comprised of large sandstone boulders. The castle is on private land and no...

Track
Eagles Hill, Mullaghbeg, Beenrour
bogtrotter 23 hours ago.
There?s plenty of room for parking at the cemetery at the top of Coad Road, near Castle Cove. From here we headed SW ... walk, Len: 21.6km, Climb: 825m, Area: Eagles Hill, Dunkerron Mountains (Irelan

  
Forum: General
An Sli
Slier159 a day ago.
Hello all,I am currently trying to organize a longs distance walk from Killarney to Derry city, using the existing National Waymarked Trails along the West coast. A 1,000km of Trail already exist ...

  
Summit Comment
Knockafeehane: From the horse's mouth
Bunsen7 22 hours ago.
This is the trail description post at Q59652 00497. It summarises the route if taken from east to west, as per track 3881.Vastly superior to my own garbled efforts!Annascaul obviously is a very we...

Track
Erris Head Loop
simon3 a day ago.
Simple walk to Erris Head. On the occasion we did it, there were dark clouds and big showers. walk, Len: 4.7km, Climb: 98m, Area: Erris Head Hill, Mayo Coastal Hill (Ireland...

  
Summit Comment
Knockafeehane: Easily Accessible and not overly demanding
Bunsen7 22 hours ago.
There is a waymarked trail to the summit which loops over the ridge leading west from this hill. See track 3881.The quickest route to the top would see you park in Annascaul village and walk up th...

  
Summit Comment
Cashloura: An enjoyable walk for all ages
CaminoPat 2 days ago.
Park at W20849 49704 at Coillte forest entrance just off the R586 Regional Road between Dunmanway and Drimoleague. Parking available for 6-8 cars. Follow forest road which is along line of disused...

Summit Comment
An Bhinn Bhuí: Benwee Loop walk towards Portacloy.
ucampbell 3 days ago.
The Loop walks here are well signposted, it's a great idea to go out onto each headland.

  
Summit Comment
Doonvinalla N Top: Coastal Hill
sandman 4 days ago.
On 26/4/2014 i spent a very enjoyable afternoon walking this area visiting the army observation hut and the stone constructed EIRE marking as part of an addition to the Benwee Head Loop walk but i...

  
Forum: General
Riddle of the Spinc
BleckCra 6 days ago.
I was at Glendalough yesterday and on the Spinc for the first time. I cannot imagine there haven't already been a thousand hours debate on the boardwalk and and that there won't be a thousand hour...


RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>