MHT CET 2026 Physics question
Not in JEE Advanced syllabus
A pure silicon crystal at temperature 300 K has electron and hole concentration () per each and phosphorus atoms () are added per cubic metre. The new hole concentration in silicon crystal is
Answer: (D)
Solution
Phosphorus is a pentavalent donor, so each atom contributes one free electron: (this is much larger than the intrinsic , so the intrinsic electrons can be neglected). By the law of mass action $
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