MHT CET 2025 Physics question
Not in JEE Advanced syllabus
In a pure silicon crystal electron-hole concentration is per m³ at 301 K. Now atoms of phosphorus are added per cubic metre. The new hole concentration in silicon is (in per m³)
Answer: (B)
Solution
By the law of mass action, holds for doped silicon at the same temperature. Here m, so . Phosphorus is a pentavalent donor, so the electron concentration becomes essentially the donor concentration,
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