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anonymous
 5 years ago
PLEASE HELP!!!!
The photic zone describes the region in which microscopic plant life receive enough light to survive. The photic zone goes to a depth where about 1% of the surface light still remains. Find the depth of the photic zone if the intensity of light (L) at a depth (d) in meters is given by L=L0e^(0.028d), where L0 is the intensity of surface light. You may use the graphing part of your calculator for this question.
Possible answers are:
a. 124 m
b. 134 m
c. 144 m
d. 154 m
e. 164 m
anonymous
 5 years ago
PLEASE HELP!!!! The photic zone describes the region in which microscopic plant life receive enough light to survive. The photic zone goes to a depth where about 1% of the surface light still remains. Find the depth of the photic zone if the intensity of light (L) at a depth (d) in meters is given by L=L0e^(0.028d), where L0 is the intensity of surface light. You may use the graphing part of your calculator for this question. Possible answers are: a. 124 m b. 134 m c. 144 m d. 154 m e. 164 m

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I know you can use your calculator to find it but I have no idea how!!!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0L=100 per cent LO=1 per cent

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Ok, so how can I use that to solve? :( do I plug 0.01e^(0.028x) into my calculator???

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You have an equation, the given, as they say. It has three unknowns  not good. We have found two of the unknowns  better. So now with one unknown you can solve for d.\[100percent=1percente ^{0.028d}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0That makes much more sense, thank you. However im not so great at solving with exponents. How do I solve? This is how I would do it but I have noooo idea. 100 10,000  = 0.028d ===>  = d ===> d= 357142.86 0.01 0.028 I know its wrong but idk why :(

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You lost your e. You can't just arbitrarily take away your e. The plants would die from lack of sunlight.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0100  = 0.028d should it start like that? 0.01e

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[100=e ^{0.028d}\]You have to use logarithms. Who knew marine biology was so much work.\[\ln 100=\ln e ^{0.028d}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So we just forget about the 0.01? does it turn into 100  = d? that gives me d=3571.43 0.028

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0There is no 0.01. The percentage signs cancel leaves 100 over one which is 100

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Ok, but I still solved and got 3571.43, which is not one of my answers. I dont understand!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0May be you did something wrong\[\ln 100= 0.028d \ln e \]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0which gives me ln (100/0.028)???? Im sorry I dont understand how to do these at all and I need to solve this problem

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You have the ability to find ln 100 and ln e on your calculator

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0lne = 1 and ln100 =4.6, correct???

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so then I take 4.6/0.028= 164.28, correct?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes but depth is always positive, so absolute value (erase negative sign)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So the answer is E, 164 m? Thanks
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