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

Energy levels in atoms and line spectra — practice question

(main)[5]

Use band theory to explain why the resistance of an intrinsic semiconductor falls as temperature rises, unlike the resistance of a copper wire.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “electrons need energy to reach the conduction band” …

Full mark scheme, point by point
Step-by-step worked solution
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