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- Need explanation for: 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)
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
As temperature is decreased
1. Resistance of conductor decreases.
2. Resistance of semiconductor increases
Since Cu is conductor its resistance decreases and resistance of germanium (semiconductor) increases here.
Correct option is 3.
Option 1)
each of these decreases
This is an incorrect option.
Option 2)
copper strip increases and that of germanium decreases
This is an incorrect option.
Option 3)
copper strip decreases and that of germanium increases
This is the correct option.
Option 4)
each of these increases
This is an incorrect option.
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