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A piece of copper and another of germanium are cooled from room temperature to 77 ~K , the resistance of

Options

  1. Aeach of them increases
  2. Beach of them decreases
  3. Ccopper decreases and germanium increases
  4. Dcopper increases and germanium decreases

Correct answer

D. copper increases and germanium decreases

Step-by-step solution

Copper is metallic conductor and germanium is semiconductor therefore as temperature decreases resistance of good conductor decreases while for semiconductor it increases.

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