If we define an effective collision frequency ef () such that the longitudinal electric conductivity is

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If we define an effective collision frequency νef(ω) such that the longitudinal electric conductivity is given by

then, by comparison with (2.18), we find that

(a) Show that in the low-frequency limit (ω ≪ νef) we have

(b) Show that in the high-frequency limit (ω ≫ νef) we have

Thus, in both limits νef is independent of ω.


Equation.

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