Verified Solution • 2025–26 Session moderate

QPage 418: Q1: Semiconductors and Semiconductor Devices Solutions — HC Verma: Concepts of Physics - Volume 2

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often confuse the valence band being full with the presence of free electrons, failing to recognize that at $T=0$ K, thermal energy is insufficient to excite electrons across the band gap, resulting in zero intrinsic carrier concentration.

In a semiconductor,

Multiple Choice Options

  • A there are no free electrons at 0 K
  • B there are no free electrons at any temperature
  • C the number of free electrons increases with temperature
  • D the number of free electrons is less than that in a conductor.

Step-by-Step Verified Solution

**Answer:** (a), (c), (d). **Step-by-Step Explanation:** At 0 K, there are no free electrons (a). The number of free electrons increases with temperature (c). The number of free electrons is less than in a conductor (d).

All Questions in this Chapter

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