Posted by Krysten on Tuesday, March 16, 2010 at 10:32pm.
Same idea as the last question but e^-(.14 z)
and Io = 7.8*10^16
and you have to look up the irradiance for light to die out enough.
Once you do that, take the ln of both sides to solve it.
From wikipedia:
"It extends from the atmosphere-water interface downwards to a depth where light intensity falls to 1 percent of that at the surface (also called euphotic depth), "
so where I = .01 Io
or
I/Io = .01 = e^-.14z
ln .01 = -.14 z
-4.6 = -.14 z
solve for z
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