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The doped semiconductor is of :

1. n – type with electron concentration n e = 5 × 10 22 m – 3
2. p – type with electron concentration n e = 2.5 ×10 10 m – 3
3. n – type with electron concentration n e = 2.5 × 10 23 m – 3
4. p – type having electron concentrations n e = 5 × 10 9 m – 3

Correct answer: p – type with electron concentration n e = 2.5 ×10 10 m – 3

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