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A concentration of 6 x 102 excess holes Ema is injected through a point contact into a piece of n-type silicon. If the concentration drops

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A concentration of 6 x 102\" excess holes Ema is injected through a point contact into a piece of n-type silicon. If the concentration drops to 20% of the injected concentration over a distance of 2 mm from the surface of the sample, calculate the concentration gradient

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