A-LevelPhysicsQuantum physicsFeb/Mar 2018Paper 4 Q117 Marks
Some electron energy bands in a solid are shown in [Figure 11.1]. The width of the forbidden band and the number density of charge carriers occupying each band depends on the nature of the solid. Use band theory to explain why (a) the resistance of a metal at room temperature increases gradually with temperature, (b) the resistance, at constant temperature, of a light-dependent resistor (LDR) decreases with increasing light intensity.
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