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← ScienceWhich risk increases when thermal expansion closes a semiconductor band gap?
A)Increased electron-hole recombination rate✓
B)Increased resonant vibration frequency
C)Decreased piezoelectric sensor accuracy
D)Decreased material fracture toughness
💡 Explanation
A narrowing band gap increases thermal excitations, thus increasing the electron-hole recombination rate because smaller energies trigger electron movement via band gap narrowing. Therefore recombination increases, rather than decreased accuracy because thermal expansion drives energy changes.
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