Current Electricity 1 Question 19
19. A piece of copper and another of germanium are cooled from room temperature to $80 K$. The resistance of
(1988, 1M)
(a) each of them increases
(b) each of them decreases
(c) copper increases and germanium decreases
(d) copper decreases and germanium increases
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Solution:
- Copper is metal and germanium is semiconductor. Resistance of a metal decreases and that of a semiconductor increases with decrease in temperature.
$\therefore$ Correct option is $(d)$.
