a. Describe the origins of diffusion current. State Fick's first law of diffusion and apply it to derive the diffusion c

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a. Describe the origins of diffusion current. State Fick's firstlaw of diffusion andapply it to derive the diffusion coefficient in asemiconductor.b. Derive a relationship between drift velocity of a charge carrierand an appliedelectric fieldQ2.a. Explain how pure gallium arsenide is converted into n-type andp-type statusb. Find the conductivity and resistivity of a pure silicon specimenat absolute zeroand at room temperature.