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The equation for the electrical conductivity in terms of electron velocity is
dv
=-eE. Using this equation obtain the expression for the conductivity in
dt
terms of frequency.
1-io'r
(a) o(@) = o (0)
(1+(@r)°
OT
1-ωτ
() σ(ω) - σ(0)|
(1-(@r)*
1+ iot
(c) o(@)=o(0)
1+(@r)
1+iøt
(d) o(@) = o (0)
(oт)*

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