Physics 9702 · AS & A Level · Energy levels in atoms and line spectra

Energy levels in atoms and line spectra — practice question

Fig. 10.1 shows some of the electron energy bands in a semiconductor material at absolute zero temperature.

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Use band theory to account for why, as the temperature of the semiconductor material increases, the electrical resistance of the sample decreases.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “electrons gain energy when temperature rises” …