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Which phenomenon causes diminished efficiency in thermoelectric crystal generators, due to backflow?

A)Umklapp scattering of phonons
B)Destructive quantum interference
C)Onsager reciprocal relations
D)Auger recombination of electrons

💡 Explanation

Umklapp scattering of phonons increases thermal conductivity, counteracting the Seebeck effect because momentum is flipped, therefore heat flows back into the cold junction faster, rather than generating optimally; quantum interference leads to localisation.

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