Discussion
The resistance of a semiconductor
Answer: B
The resistance of a semiconductor decreases with increase in temperature.
As temperature rises, more electrons gain enough energy to cross the band gap into the conduction band, creating more electron-hole pairs. The number of charge carriers increases rapidly, so the resistance falls: semiconductors have a negative temperature coefficient of resistance.
Increasing resistance with temperature is the behaviour of metals. The resistance does not become independent of temperature, infinite or zero.
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