Is My Procedure Correct for Charge Density and Electric Field?

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Is my procedure/result correct? Are these equations relevant for the problem? Many thanks!


Homework Statement

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Homework Equations

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The Attempt at a Solution

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http://img511.imageshack.us/img511/5962/cdensity.jpg
 
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Your procedure looks right, so I'd expect that the answer should be right as well. (I don't know offhand what it's supposed to be, of course)
 
Thank you very much!
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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