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  • Solve! A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of

A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of

  • Option 1)

    each of them increases

  • Option 2)

    each of them decreases

  • Option 3)

    copper decreases and germanium increases

  • Option 4)

    copper increases and germanium decreases

 

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

 

 

At T = 77 K

By decreasing temperature resistance of metal decrease while that of semiconductor increases hence resistance of copper will decrease while that of germanium increases.


Option 1)

each of them increases

Option 2)

each of them decreases

Option 3)

copper decreases and germanium increases

Option 4)

copper increases and germanium decreases

Posted by

Avinash

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