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  • Need clarity, kindly explain! A strip of copper and another germanium are cooled from room temperature to 80 K. The resistance of

A strip of copper and another germanium are cooled from room temperature to 80 K. The resistance of

  • Option 1)

    each of these decreases

  • Option 2)

    copper strip increases and that of germanium decreases

  • Option 3)

    copper strip decreases and that of germanium increases

  • Option 4)

    each of these increases

 

Answers (1)

best_answer

As we have learnt,

 

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

 

 Resistance of conductor decreases with increase in temperature while that of semiconductor  increases with decreasing temperature. Hence resistance of copper strip will decrease while that germanilum will increase.

 


Option 1)

each of these decreases

Option 2)

copper strip increases and that of germanium decreases

Option 3)

copper strip decreases and that of germanium increases

Option 4)

each of these increases

Posted by

Avinash

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