what makes ?.........

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what makes ?.........

Postby k mac » Wed Apr 12, 2006 2:47 pm

...white water....white!!?!?

whilst sitting on the beach today this started to make me dizzy thinking about it :lol:
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Postby PapaWoolacombe » Wed Apr 12, 2006 2:51 pm

Bloody hell there he is we were just talking about you in Surfing-Waves
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Postby k mac » Wed Apr 12, 2006 2:54 pm

:shock: ears ? buring ....must take a look :wink:
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Postby lostboy » Wed Apr 12, 2006 3:13 pm

Increased oxygen in the water?
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Postby PapaWoolacombe » Wed Apr 12, 2006 3:24 pm

Aye thats the one. Air pockets in water reflect more light than still water. Thus why ice /snow etc appears white.
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Postby k mac » Wed Apr 12, 2006 5:41 pm

Air pockets in water reflect more light than still water. Thus why ice /snow etc appears white.


Ah...so lets say in theory a wave machine which created a lot of white water was in a room that was 100% no light the 'white water' would be not white any more ? Also the samw with snow ? It wouldnt be 'white' in complete 100% darkness ?
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Postby bren-escape » Wed Apr 12, 2006 7:10 pm

without light nothing will have colour :lol:
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Postby MACHINE » Thu Apr 13, 2006 7:06 am

WHAT NOISE DOES A TREE MAKE WHEN YOU CLAP IT WITH ONE HAND AND NO-ONE'S ABOUT TO HEAR IT AND ALL THAT XEN MALLARKY?
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Postby k mac » Thu Apr 13, 2006 3:11 pm

hmmm :?
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Postby stephh » Thu Apr 13, 2006 3:35 pm

Dunno - ask Van Morrison he does that "the sound of one hand clapping" song :D
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Postby PapaWoolacombe » Thu Apr 13, 2006 3:36 pm

Aye its all in perception :p
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Postby purpleandy » Fri Apr 14, 2006 6:34 pm

when any wave (eg llght) hits a boundary between two substances then it will either be transmitted or reflected. the white water is full of tiny bubbles, each of which provides an air / water boundary. as water and air have significantly different refractive indices there is a very high probavility that as light hits this boundary it will be reflected. As the bubbles tend to be spherical then the light will reflect in a myriad of different directions, creating the "whiteness" you see, rather than anything resembling a coherent image. Water also tends to absorb some of the wavelengths of sunlight (which is why it looks blue) , meaning that the reflected light would contain a significant amount of blue light , looking 'clean' and even "whiter" .

or soemthing like that :wink:

if it was pitch black ie there was no light, then there would be no reflection, meaning that light would not eneter your eye. hence, you wouldn't "see" anything .other than black.......and at that black is just the absence of light........

as for the clapping the tree stuff, sound is just microscopic variations in air pressure - it makes no difference as to whether there;s an audience......
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Postby Snowfun » Tue Apr 18, 2006 8:53 am

with the white water thing, just remembered that when out in atlantic on dads boat years ago, no light but white water from boat was phosphoresent...or however you spell it. is that a trick but it kind of glowed, think remember him saying its going through certain algae rich water creates effect like you get with glow worms.. am i dreaming or was this right ?
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Postby PapaWoolacombe » Tue Apr 18, 2006 11:48 am

There are effects like that yes, for a certain time after dusk Algaes do emmit 'light'

Also even in the darkness night there is still some light, moon light, light refracted from beyon the horrizon via clouds etc...
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Postby Monkey_Alan » Tue Apr 18, 2006 2:24 pm

snowfun wrote:with the white water thing, just remembered that when out in atlantic on dads boat years ago, no light but white water from boat was phosphoresent...or however you spell it. is that a trick but it kind of glowed, think remember him saying its going through certain algae rich water creates effect like you get with glow worms.. am i dreaming or was this right ?


Bioluminescent algea 8)
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Postby danny1 » Tue Apr 18, 2006 2:38 pm

if no one is there do waves make a sound when they break?
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Postby Snowfun » Tue Apr 18, 2006 2:43 pm

Bioluminescent algea
whoa! and to think a certain banshee thinks your all uneducated :lol:
if its not snow its water
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Postby PapaWoolacombe » Tue Apr 18, 2006 5:04 pm

Danny.....

purpleandy wrote: sound is just microscopic variations in air pressure - it makes no difference as to whether there;s an audience......
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Postby Chris F » Fri Jul 14, 2006 11:20 am

stephh wrote:Dunno - ask Van Morrison he does that "the sound of one hand clapping" song :D


It sounds like this ...........................

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Postby stephh » Fri Jul 14, 2006 9:38 pm

Yes always............................... :D
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Postby thedeadly » Fri Jul 14, 2006 10:10 pm

there's a story or myth somewhere of a fighter pilot losing his nav kit and found the carrier by following the luminance of its wake
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Postby malpractice » Sat Jul 15, 2006 8:19 pm

wasnt that in the film apollo 13, Jim Lovell?
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