MDCAT Physics MCQ #527

Why do semiconductors show negative temperature coefficient unlike metals?

MDCAT Physics MCQ #527

  1. Question 1

    Q1. Why do semiconductors show negative temperature coefficient unlike metals?

    • A) More free electrons at higher temps
    • B) Lattice vibrations impede flow
    • C) Ionization increases resistance
    • D) Valence band narrows with heat

    Answer: More free electrons at higher temps

    Explanation: Thermal excitation boosts carriers. Option B describes metallic behavior.