A-LevelPhysicsQuantum physicsMay/June 2018Paper 4 Q118 Marks
11 (a) (i) Explain what is meant by a photon. (ii) By reference to intensity of light, state one piece of evidence provided by the photoelectric effect for a particulate nature of light. (b) Some electron energy levels in a solid are illustrated in Fig. 11.1. [Figure 11.1] A semiconductor material has a very high resistance in darkness. Light incident on the semiconductor material causes its resistance to decrease. Explain the resistance of the semiconductor material in different light conditions.
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