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Question 20206
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Semiconductors: Energy Band Gap — Insulator vs Semiconductor MCQ

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Energy Band Gap — Insulator vs SemiconductorEasyQuestion 20206

Question

The difference between an insulator and a semiconductor is primarily:
  1. A
    Insulators have no energy bands
  2. B
    Semiconductors have a smaller energy gap (~0.1–3 eV) vs insulators (>5 eV)
    Correct
  3. C
    Insulators conduct at high T
  4. D
    Semiconductors have only holes

Correct answer

Semiconductors have a smaller energy gap (~0.1–3 eV) vs insulators (>5 eV)

Explanation

Si: Eg ≈ 1.1 eV; Ge: Eg ≈ 0.67 eV. Diamond (insulator): Eg ≈ 5.5 eV. Thermal energy at room temperature (~0.026 eV) can bridge a small gap but not a large one.

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