at absolute zero temperature a crystal of pure germanium behaves as:-a) a perfect conductor. b) a perfect insulator. c)a semiconductor d) none of these
Answers
Answer:
At absolute zero temperature a crystal of pure germanium behaves as a perfect insulator.
b is correct.
Explanation:
Insulator :
Insulator are those materials which have no free electrons.
According to band gap theory,
The energy band gap is more between the conduction band and valance band in the insulators.
The energy band gap is very very less between the conduction band and valance band in the conductors.
At absolute zero temperature, a crystal of pure germanium behaves as a perfect insulator.
When the temperature rises up of the material then, the conductivity of the material rises also.
A semiconductor behaves as like insulator at absolute zero temperature. when an electron gains the enough energy that these are capable to move to conduction band from the valance band.
Hence, At absolute zero temperature a crystal of pure germanium behaves as a perfect insulator.
Answer:
A pure germanium behaves at ‘absolute zero’ temperature is called b) perfect insulator.
Explanation:
It is known that pure germanium belongs to intrinsic semiconductor type of materials. The distance between the ‘valence and conduction’ band is very high in these kind of semiconductors. The semiconductors like germanium tend to become conductor at high temperature as the electrons get high energy from the thermal energy to exit from valence band and reach the conduction band.
Hence at low temperatures the semiconductors tend to behave like insulators due to their wide band gap. So at absolute zero pure germanium will be behaving like a ‘perfect insulator’.