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A piece of copper and another of germanium are cooled from room temperature to 80K. The resistance
- a)of each of them decreases
- b)of each of them increases
- c)copper increases and that of germanium decreases
- d)copper decreases and that of germanium increases
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
A piece of copper and another of germanium are cooled from room temper...
Explanation:Copper is a conductor and we know that for conductors, resistance is directly proprtional to temperature. Therefore on decreasing temperature resistance also decreases.Whereas, germanium is a semiconductor and for semiconductors, resistance is inversely proportional to temperature. So on decreasing temperature resistance increases.
Most Upvoted Answer
A piece of copper and another of germanium are cooled from room temper...
Explanation:
When a material is cooled, its resistance tends to change due to the changes in its atomic structure and electron behavior. In the case of copper and germanium, both materials exhibit different behavior when cooled from room temperature to 80K.
1. Copper:
Copper is a metal that exhibits a positive temperature coefficient of resistance (PTCR). This means that as the temperature decreases, the resistance of copper also decreases. The decrease in resistance can be attributed to the decrease in lattice vibrations and the decrease in collisions between electrons and lattice defects. At lower temperatures, the copper atoms become more ordered, resulting in a more efficient flow of electrons and a decrease in resistance.
2. Germanium:
Germanium is a semiconductor material that exhibits a negative temperature coefficient of resistance (NTCR). This means that as the temperature decreases, the resistance of germanium increases. The increase in resistance can be attributed to the decrease in thermal energy, which leads to a decrease in the number of charge carriers (electrons and holes) available for conduction. At lower temperatures, the decrease in the number of charge carriers results in an increase in resistance.
Conclusion:
Based on the behavior of copper and germanium, the correct answer is option 'D' - the resistance of copper decreases when cooled from room temperature to 80K, while the resistance of germanium increases.
When a material is cooled, its resistance tends to change due to the changes in its atomic structure and electron behavior. In the case of copper and germanium, both materials exhibit different behavior when cooled from room temperature to 80K.
1. Copper:
Copper is a metal that exhibits a positive temperature coefficient of resistance (PTCR). This means that as the temperature decreases, the resistance of copper also decreases. The decrease in resistance can be attributed to the decrease in lattice vibrations and the decrease in collisions between electrons and lattice defects. At lower temperatures, the copper atoms become more ordered, resulting in a more efficient flow of electrons and a decrease in resistance.
2. Germanium:
Germanium is a semiconductor material that exhibits a negative temperature coefficient of resistance (NTCR). This means that as the temperature decreases, the resistance of germanium increases. The increase in resistance can be attributed to the decrease in thermal energy, which leads to a decrease in the number of charge carriers (electrons and holes) available for conduction. At lower temperatures, the decrease in the number of charge carriers results in an increase in resistance.
Conclusion:
Based on the behavior of copper and germanium, the correct answer is option 'D' - the resistance of copper decreases when cooled from room temperature to 80K, while the resistance of germanium increases.
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A piece of copper and another of germanium are cooled from room temperature to 80K. The resistancea)of each of them decreasesb)of each of them increasesc)copper increases and that of germanium decreasesd)copper decreases and that of germanium increasesCorrect answer is option 'D'. Can you explain this answer?
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A piece of copper and another of germanium are cooled from room temperature to 80K. The resistancea)of each of them decreasesb)of each of them increasesc)copper increases and that of germanium decreasesd)copper decreases and that of germanium increasesCorrect 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 another of germanium are cooled from room temperature to 80K. The resistancea)of each of them decreasesb)of each of them increasesc)copper increases and that of germanium decreasesd)copper decreases and that of germanium increasesCorrect 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 another of germanium are cooled from room temperature to 80K. The resistancea)of each of them decreasesb)of each of them increasesc)copper increases and that of germanium decreasesd)copper decreases and that of germanium increasesCorrect answer is option 'D'. Can you explain this answer?.
A piece of copper and another of germanium are cooled from room temperature to 80K. The resistancea)of each of them decreasesb)of each of them increasesc)copper increases and that of germanium decreasesd)copper decreases and that of germanium increasesCorrect 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 another of germanium are cooled from room temperature to 80K. The resistancea)of each of them decreasesb)of each of them increasesc)copper increases and that of germanium decreasesd)copper decreases and that of germanium increasesCorrect 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 another of germanium are cooled from room temperature to 80K. The resistancea)of each of them decreasesb)of each of them increasesc)copper increases and that of germanium decreasesd)copper decreases and that of germanium increasesCorrect answer is option 'D'. Can you explain this answer?.
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