CBSE Class 12 Physics 2015 Delhi Set 1 Paper

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Question : 8
Total: 26
Distinguish between 'intrinsic' and 'extrinsic' semiconductors.
Solution:  
Distinction between intrinsic & extrinsic semiconductor
   Intrinsic Semiconductor  ExtrinsicSemiconductor
 (i)  Without any impurity atoms.  Doped with trivalent/ pentavalent impurity atoms.
 (ii)  ne=nh  nenh
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