Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > With the increase in temperature, the resisti...
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With the increase in temperature, the resistivity of an intrinsic semiconductor decreases. This is because, with the increase of temperature
- a)the carrier concentration decreases, but the mobility of carriers increases.
- b)the carrier concentration increases, but the mobility of carriers decreases.
- c)the carrier concentration remains the same but the mobility of carriers decreases.
- d)both the carrier concentration and mobility of carriers decreases
Correct answer is option 'B'. Can you explain this answer?
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With the increase in temperature, the resistivity of an intrinsic semi...
In an intrinsic semiconductor, as the temperature increases mobility is slightly reduced since mobility of charge carrier is inversely proportional to temperature. This will slightly reduce the conductivity. But, due to temperature effect, large number of covalent bonds are broken which creates electrons and holes and this increases the conductivity by a larger value. As a result of this resistivity is decreased 
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With the increase in temperature, the resistivity of an intrinsic semi...
Explanation:
Temperature has a significant impact on the resistivity of an intrinsic semiconductor. The resistivity of an intrinsic semiconductor decreases with the increase in temperature due to the following reasons:
1. Increase in carrier concentration:
As temperature increases, more electrons are excited from the valence band to the conduction band, which contributes to the increase in the number of charge carriers (i.e. electrons and holes) in the semiconductor material.
2. Decrease in mobility of carriers:
However, despite the increase in carrier concentration, the mobility of the charge carriers decreases with the increase in temperature. This is because the increase in temperature leads to an increase in lattice vibrations, which scatter the charge carriers and reduce their mobility.
3. Overall effect:
Therefore, the overall effect of temperature on the resistivity of an intrinsic semiconductor is determined by the combined effect of the increase in carrier concentration and the decrease in carrier mobility. As the increase in carrier concentration has a stronger effect on the resistivity than the decrease in carrier mobility, the resistivity of an intrinsic semiconductor decreases with an increase in temperature.
Conclusion:
In conclusion, the correct answer is option B, i.e. the carrier concentration increases, but the mobility of carriers decreases. This is because with the increase in temperature, more electrons are excited to the conduction band, leading to an increase in carrier concentration, but the increased lattice vibrations also reduce the mobility of the charge carriers.
Temperature has a significant impact on the resistivity of an intrinsic semiconductor. The resistivity of an intrinsic semiconductor decreases with the increase in temperature due to the following reasons:
1. Increase in carrier concentration:
As temperature increases, more electrons are excited from the valence band to the conduction band, which contributes to the increase in the number of charge carriers (i.e. electrons and holes) in the semiconductor material.
2. Decrease in mobility of carriers:
However, despite the increase in carrier concentration, the mobility of the charge carriers decreases with the increase in temperature. This is because the increase in temperature leads to an increase in lattice vibrations, which scatter the charge carriers and reduce their mobility.
3. Overall effect:
Therefore, the overall effect of temperature on the resistivity of an intrinsic semiconductor is determined by the combined effect of the increase in carrier concentration and the decrease in carrier mobility. As the increase in carrier concentration has a stronger effect on the resistivity than the decrease in carrier mobility, the resistivity of an intrinsic semiconductor decreases with an increase in temperature.
Conclusion:
In conclusion, the correct answer is option B, i.e. the carrier concentration increases, but the mobility of carriers decreases. This is because with the increase in temperature, more electrons are excited to the conduction band, leading to an increase in carrier concentration, but the increased lattice vibrations also reduce the mobility of the charge carriers.
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With the increase in temperature, the resistivity of an intrinsic semiconductor decreases. This is because, with the increase of temperaturea)the carrier concentration decreases, but the mobility of carriers increases.b)the carrier concentration increases, but the mobility of carriers decreases.c)the carrier concentration remains the same but the mobility of carriers decreases.d)both the carrier concentration and mobility of carriers decreasesCorrect answer is option 'B'. Can you explain this answer?
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With the increase in temperature, the resistivity of an intrinsic semiconductor decreases. This is because, with the increase of temperaturea)the carrier concentration decreases, but the mobility of carriers increases.b)the carrier concentration increases, but the mobility of carriers decreases.c)the carrier concentration remains the same but the mobility of carriers decreases.d)both the carrier concentration and mobility of carriers decreasesCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about With the increase in temperature, the resistivity of an intrinsic semiconductor decreases. This is because, with the increase of temperaturea)the carrier concentration decreases, but the mobility of carriers increases.b)the carrier concentration increases, but the mobility of carriers decreases.c)the carrier concentration remains the same but the mobility of carriers decreases.d)both the carrier concentration and mobility of carriers decreasesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for With the increase in temperature, the resistivity of an intrinsic semiconductor decreases. This is because, with the increase of temperaturea)the carrier concentration decreases, but the mobility of carriers increases.b)the carrier concentration increases, but the mobility of carriers decreases.c)the carrier concentration remains the same but the mobility of carriers decreases.d)both the carrier concentration and mobility of carriers decreasesCorrect answer is option 'B'. Can you explain this answer?.
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