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Define: i) Conduction band ii) Forbidden band iii) Valance band iv) Doping

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i) Conduction band: The energy band containing conducting electrons is called conduction band. 

ii)Forbidden band : The energy gap between conduction band and valance band is called forbidden band. 

iii)Valance band : The energy band containing valance electrons is called valance band. 

iv)Dopping: The process of adding impurities in pure semiconductor is called dopping.

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