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Re: [at-l] I'm confused



I must be the confused one.
I just accepted the conversion given me from elsewhere.
At any rate, your figures are better than the ones I used for this issue
since they increase the sun's dose of UV-A and UV-B in my calculations:

J/M^2	mw-s/cm^2 	dose @ 1 minute	
800	80		4800
1000	100		6000
2000	200		12000
3000	300		18000
4000	400		24000
5000	500		48000

instead of 

J/m2	mw-s/cm2	
800	1.3344	
1000	1.668	
2000	3.336	
3000	5.004	
4000	6.672	
5000	8.34	

The result is to diminish the time necessary for the sun to do its
sterilizing work, using UV-A and -B. It likewise increases the miniscule
amount of UV-C that reaches the ground, esp in high altitudes by the same
amount:
nearly 60 times greater than I had calculated.

----------
> From: Pete J. Osler <osler@btv.ibm.com>
> To: at-l@backcountry.net
> Subject: [at-l] I'm confused
> Date: Tuesday, August 03, 1999 7:35 AM
> 
> > 1 joule/square meter = 16.68 mw-s/10,000 sq cm  =  .001668 mw-s/sq cm
>  
> If I remember my high-school physics:
> 
> 1 Watt is defined as 1 Joule / Sec, or conversely 1 Watt-Sec = 1 Joule
> 
> 1000 mWatt-Sec = 1 Watt-Sec = 1 Joule
> 
> 1 Joule / M^2 = 1 Watt-Sec / M^2 = 1000 mWatt-Sec / M^2 ( where '^2'
means 'squared' )
> 
> 10000 cM^2 = 1 M^2. ( where '^2' means 'squared' )
> 
> 1 Joule / M^2 = 1000 mWatt-Sec / 10000 cM^2 = 0.1 mWatt-Sec / cM^2 
> 
> ...Pete Osler Ga->Me '81
> * From the Appalachian Trail Mailing List |  http://www.backcountry.net  *
* From the Appalachian Trail Mailing List |  http://www.backcountry.net  *

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