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Which mechanism reduces conductivity within semiconductor strain gauges?

A)Piezoresistive modulation of the band gap
B)Increased electron-phonon scattering
C)Auger recombination dominates carrier loss
D)Franz-Keldysh effect enhances absorption

💡 Explanation

Piezoresistivity changes the band gap, altering the energy needed for electrons to enter the conduction band, thereby reducing conductivity, because applied stress modifies the interatomic spacing and electronic band structure; therefore A rather than B, because increased scattering affects mobility but is less dominant.

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