Find the minimum energy of electron-hole pair formation in an impurity-free semiconductor whose ...

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Find the minimum energy of electron-hole pair formation in an impurity-free semiconductor whose electric conductance increases \( \eta=5.0 \) times when the temperature increases from \( T_{1}=300 \mathrm{~K} \) to \( T_{2}=400 \mathrm{~K} \)
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