A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of:
each of them decreases
each of them increases
copper increases and germanium decreases
copper decreases and germanium increases.
A
each of them decreases
B
copper decreases and germanium increases.
C
each of them increases
D
copper increases and germanium decreases
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Solution
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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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