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 -

n_{e}= n_{\lambda }= AT^{3/2}e^{-Eg /2KT}
 

- 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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