Verified Solution • 2025–26 Session moderate

QPage 418: Q7: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Page 418: Q7 Solution: A semiconductor is doped with a donor impurity.

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often confuse donor doping with acceptor doping and assume it raises hole concentration or affects both carriers equally. Remember that a donor impurity contributes extra electrons, so the electron concentration $n$ rises while the hole concentration $p$ falls (by the mass‑action relation $np=n_i^2$).

A semiconductor is doped with a donor impurity.

Multiple Choice Options

  • A The hole concentration increases.
  • B The hole concentration decreases.
  • C The electron concentration increases.
  • D The electron concentration decreases.

Step-by-Step Verified Solution

**Answer:** (c) The electron concentration increases. **Step-by-Step Explanation:** Doping with a donor impurity increases the electron concentration.

All Questions in this Chapter

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