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Which mechanism prevents electron acceleration in ideal crystal?

A)Bragg reflection prohibits forward momentum
B)Electron-phonon coupling increases resistance
C)Umklapp scattering induces energy loss
D)Crystal defects create scattering sites

💡 Explanation

Perfect crystal lattices prompt Bragg reflection, where electrons deflect because incident waves constructively interfere. This prohibits continuous acceleration rather than increased resistance from electron-phonon interactions that dominate imperfect crystals; therefore preventing current rise.

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