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A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]
- a)resistance of each will increase
- b)resistance of copper will decrease
- c)resistance of copper will increase while thatof germanium will decrease
- d)resistance of copper will decrease while thatof germanium will increase
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
A piece of copper and other of germanium arecooled from the room tempe...
Copper is a conductor, so, its resistance
decreases on decreasing temperature as
thermal agitation decreases whereas
germanium is semiconductor, therefore, on
decreasing temperature resistance increases.
decreases on decreasing temperature as
thermal agitation decreases whereas
germanium is semiconductor, therefore, on
decreasing temperature resistance increases.
Most Upvoted Answer
A piece of copper and other of germanium arecooled from the room tempe...
Cooling Effect on Resistance of Copper and Germanium
When a material is cooled, its resistance may either increase or decrease depending on its temperature coefficient of resistance (TCR). The TCR is a measure of how much the resistance of a material changes with temperature. In this case, we are cooling a piece of copper and a piece of germanium from room temperature to 80 K, and we need to determine the effect on their resistances.
1. Copper:
Copper has a positive TCR, which means that its resistance increases with increasing temperature. Therefore, when copper is cooled from room temperature to 80 K, its resistance will increase. This is because as the temperature decreases, the lattice vibrations in the copper crystal lattice decrease, leading to a decrease in the mobility of free electrons and an increase in resistance.
2. Germanium:
Germanium, on the other hand, has a negative TCR, which means that its resistance decreases with increasing temperature. Therefore, when germanium is cooled from room temperature to 80 K, its resistance will decrease. This is because as the temperature decreases, the lattice vibrations in the germanium crystal lattice decrease, leading to an increase in the mobility of charge carriers and a decrease in resistance.
In conclusion, when a piece of copper and a piece of germanium are cooled from room temperature to 80 K, the resistance of copper will increase while the resistance of germanium will decrease. This can be attributed to the different temperature coefficients of resistance of the two materials.
Introduction
When a material is cooled, its resistance may either increase or decrease depending on its temperature coefficient of resistance (TCR). The TCR is a measure of how much the resistance of a material changes with temperature. In this case, we are cooling a piece of copper and a piece of germanium from room temperature to 80 K, and we need to determine the effect on their resistances.
Explanation
1. Copper:
Copper has a positive TCR, which means that its resistance increases with increasing temperature. Therefore, when copper is cooled from room temperature to 80 K, its resistance will increase. This is because as the temperature decreases, the lattice vibrations in the copper crystal lattice decrease, leading to a decrease in the mobility of free electrons and an increase in resistance.
2. Germanium:
Germanium, on the other hand, has a negative TCR, which means that its resistance decreases with increasing temperature. Therefore, when germanium is cooled from room temperature to 80 K, its resistance will decrease. This is because as the temperature decreases, the lattice vibrations in the germanium crystal lattice decrease, leading to an increase in the mobility of charge carriers and a decrease in resistance.
Conclusion
In conclusion, when a piece of copper and a piece of germanium are cooled from room temperature to 80 K, the resistance of copper will increase while the resistance of germanium will decrease. This can be attributed to the different temperature coefficients of resistance of the two materials.
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A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]a)resistance of each will increaseb)resistance of copper will decreasec)resistance of copper will increase while thatof germanium will decreased)resistance of copper will decrease while thatof germanium will increaseCorrect answer is option 'D'. Can you explain this answer?
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A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]a)resistance of each will increaseb)resistance of copper will decreasec)resistance of copper will increase while thatof germanium will decreased)resistance of copper will decrease while thatof germanium will increaseCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]a)resistance of each will increaseb)resistance of copper will decreasec)resistance of copper will increase while thatof germanium will decreased)resistance of copper will decrease while thatof germanium will increaseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]a)resistance of each will increaseb)resistance of copper will decreasec)resistance of copper will increase while thatof germanium will decreased)resistance of copper will decrease while thatof germanium will increaseCorrect answer is option 'D'. Can you explain this answer?.
A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]a)resistance of each will increaseb)resistance of copper will decreasec)resistance of copper will increase while thatof germanium will decreased)resistance of copper will decrease while thatof germanium will increaseCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]a)resistance of each will increaseb)resistance of copper will decreasec)resistance of copper will increase while thatof germanium will decreased)resistance of copper will decrease while thatof germanium will increaseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A piece of copper and other of germanium arecooled from the room temperature to 80 K, then [1993]a)resistance of each will increaseb)resistance of copper will decreasec)resistance of copper will increase while thatof germanium will decreased)resistance of copper will decrease while thatof germanium will increaseCorrect answer is option 'D'. Can you explain this answer?.
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