Question:
Analyze the impact of temperature on the electronic conductivity of metals and semiconductors. Choose the correct statement:
Analyze the impact of temperature on the electronic conductivity of metals and semiconductors. Choose the correct statement:
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Temperature rises? Metals lose conductivity, semiconductors gain it. Just remember: electrons scatter in metals, multiply in semiconductors!
Updated On: Jun 13, 2025
- Increasing temperature decreases the conductivity of metals but increases for semiconductors
- Increasing temperature increases the conductivity of both metals and semiconductors
- Increasing temperature decreases the conductivity of both metals and semiconductors
- Increasing temperature increases the conductivity of metals but decreases for semiconductors
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The Correct Option is A
Solution and Explanation
Effect of Temperature on Metals:
- In metals, conductivity is primarily due to free electrons.
- As temperature increases, metal atoms vibrate more (increased lattice vibrations).
- These vibrations scatter the electrons more frequently, reducing mobility.
- Hence, electrical conductivity decreases with increasing temperature.
- In semiconductors, conductivity depends on the number of charge carriers (electrons and holes).
- Increasing temperature excites more electrons from the valence band to the conduction band.
- This leads to a higher number of free carriers.
- So, electrical conductivity increases with temperature.
- (B) is wrong: metals show decreased conductivity with temperature.
- (C) is wrong: semiconductors increase in conductivity, not decrease.
- (D) is the reverse of the correct behavior.
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