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A Si sample with 10¹5 cm³ donors is uniformly optically excited at room temperature in such a way that
10¹⁹ cm³ EHPs (Electron-Hole pairs) are generated per second. Find the separation of the quasi-Fermi
levels and the change of conductivity upon shining the light. Electron and hole lifetimes are both 10 µs
and D₂ = 12 cm²/s.

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