Question:
A piece of copper and other of germanium are cooled from the room temperature to 80 K, then
A piece of copper and other of germanium are cooled from the room temperature to 80 K, then
Updated On: May 2, 2024
- resistance of each will increase
- resistance of copper will decrease
- the resistance of copper will increase while that of germanium will decrease
- the resistance of copper will decrease while that of germanium will increase
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The Correct Option is D
Solution and Explanation
Copper is a conductor so its resistance decreases on decreasing temperature as thermal agitation decreases whereas germanium is semiconductor which on decreasing temperature resistance increases.
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Concepts Used:
Semiconductors
Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.
Properties of Semiconductor:
- Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
- Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
- Lesser power losses.
Uses of Semiconductor:
- Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
- Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.