1. The problem statement, all variables and given/known data Hey guys, I am trying to draw out the electromagnetic absorpton vs frequency graph for a known dielectric constant ε in a medium but I am kind of stucked. I am studying from the Griffiths' book if you can catch me up from there, equations are on pg. 394, in chapter 9.4 Absorption and dispersion, 3rd edition 2. Relevant equations Well, after a long proof, Griffiths concludes that the electromagnetic waves are (not suprisingly); E(z,t) = E 0 e-κz e i(kz-ωt) and B(z,t) = B 0 e-κz e i(kz-ωt) where κ is the complex part, and k is the real parts of the "wave number" 3. The attempt at a solution After we all know this given information I just tried to put all the values I know (like the frequency range, ε, σ, etc.) and excluded the imaginary(E) to find absorption. (and then simply plot it on MATLAB.) Where am I mistaken? I believe I should not simply plot the imaginary part. But what should I do to get a nice Absorption vs frequency spectrum? Cheers and thank you in prior!