In an extrinsic n-type semiconductor, the free electrons donated by the impurity atoms occupy energy levels in

Step-by-step solution

- (C) the band gap and are close to the conduction band: This is the correct answer. The free electrons donated by the impurity atoms occupy energy levels in the band gap, and these levels are close to the conduction band. When the temperature is increased, these electrons can easily gain enough energy to jump into the conduction band. - (D) the band gap and are close to the valence band: This is incorrect. Donor levels are closer to the conduction band, not the valence band. Conclusion: The correct answer is: (C)