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← ScienceWhich outcome occurs when hydrostatic pressure increases on germanium?
A)Indirect band gap becomes direct✓
B)Thermal conductivity is greatly reduced
C)Intrinsic carrier concentration decreases
D)Hall coefficient becomes exponentially larger
💡 Explanation
Increased pressure modifies the germanium's lattice spacing, altering the electron band structure. The indirect to direct band gap transition is caused by band structure deformation because cell dimensions change; therefore, optical absorption increases, rather than phonon scattering or carrier freeze-out.
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