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← ScienceWhich outcome results when rapid cooling stresses a gallium arsenide crystal?
A)Increased point defect concentration✓
B)Enhanced electron-phonon coupling
C)Higher superconducting critical temperature
D)Increased crystal lattice parameter
💡 Explanation
An increased point defect concentration results because rapid cooling introduces non-equilibrium vacancies via **thermal shock**, therefore vacancies form along grain boundaries rather than maintaining crystalline order; enhanced electron mobility and reduced scattering are possible rather than alternatives.
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