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(b) (i) Describe the properties of semiconduction in solids, distinguishing between intrinsic and extrinsic semiconductors. Use examples to illustrate your answer. (ii) Show how a

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(b) (i) Describe the properties of semiconduction in solids, distinguishing between intrinsic and extrinsic semiconductors. Use examples to illustrate your answer. (ii) Show how a LED (e.g. GaAs) illustrates the optical properties of junctions. [18 marks] (b) (i) Describe the properties of semiconduction in solids, distinguishing between intrinsic and extrinsic semiconductors. Use examples to illustrate your answer. (ii) Show how a LED (e.g. GaAs) illustrates the optical properties of junctions. [18 marks]

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