APFIVE Impurities and Thermal Conductivity in Metals
The thermal conductivity of a pure metal decreases significantly when it is doped with impurity atoms. Which of the following statements best provides a microscopic explanation for this phenomenon?
A
Impurity atoms disrupt the lattice, increasing phonon scattering
B
Impurities increase the material’s heat capacity
C
Impurities enhance free electron movement between atoms
D
Doping always increases atomic spacing uniformly
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