why does the wiedemann franz law always work at high temperatures? why are the scattering processes...

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why does the wiedemann franz law always work at hightemperatures? why are the scattering processes simular at thatrange, and what would happen if a electric field is applied

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First Part of QuestionWhy does Wiedemann Franz always work at High temperatureWiedmann Franz Law state that the ratio ofthermaland electronicconductivity directlyproportion to the temperaturehere k is thermal conductivity and sigma is electricalconductivity and L Lorentz Noat low temperatures T tends to 0 K heat and charge currents arecarried by the same quasi Particles holes or electronsAt a finite value of    See Answer
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