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- Help me understand! By increasing the temperature, the specific resistance of a conductor and a semiconductor
By increasing the temperature, the specific resistance of a conductor and a semiconductor
- Option 1)
increases for both
- Option 2)
decreases for both
- Option 3)
increases, decreases
- Option 4)
decreases, increases
Answers (1)
As we learnt in
Number of electrons or holes -
- wherein
Eg = Energy gap
K = Boltzmann Constant
T = Temperature in kelvin
On increasing temperature, the number of current carried increases
For Conductor
As we increase the temperature, the frequency of collision increases and hence resistance also increases.
For Semiconductor
As we increase the temperature, the frequency of collision increases but number of free electrons also increases. The dominant factor is number of free electron and hence specific resistance of semiconductor decreases with increasing temperature.
Correct option is 3.
Option 1)
increases for both
This is an incorect option.
Option 2)
decreases for both
This is an incorect option.
Option 3)
increases, decreases
This is the correct option.
Option 4)
decreases, increases
This is an incorect option.
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