The temperature dependence of resistances of Cu and undoped Si in the temperature range 300-400 K, is best described by

  • Option 1)

    Linear increase for Cu, linear increase for Si.

  • Option 2)

    Linear increase for Cu, exponential increase for Si.

  • Option 3)

    Linear increase for Cu, exponential decrease for Si.

  • Option 4)

    Linear decrease for Cu, linear decrease for Si.

 

Answers (2)

As we learnt in

Temperature dependent Resistivity -

\rho=\rho_{o}(1+ \alpha (T-T_{o}))

-

Resistivity of cu increases with increase in temperature because relaxation time decreases 

Resistivity of semiconductor decreases exponentially with increase in temperature as 

\rho _{T}=\rho _{1}e(E_{g}/K_{B}T)


Option 1)

Linear increase for Cu, linear increase for Si.

This option is incorrect 

Option 2)

Linear increase for Cu, exponential increase for Si.

This option is incorrect 

Option 3)

Linear increase for Cu, exponential decrease for Si.

This option is correct 

Option 4)

Linear decrease for Cu, linear decrease for Si.

This option is incorrect 

N neha

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