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Which outcome limits electron mobility as impurities increase?

A)Decreased mean free path
B)Increased Fermi energy level
C)Enhanced phonon dispersion rate
D)Polaron formation energy exceeds threshold

💡 Explanation

Increased impurities induce more electron scattering, which reduces conductivity via the Drude model. This scattering decreases the mean free path because electrons collide more frequently rather than propagating freely, therefore impeding the momentum transfer.

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