Question

In some substance charge can flow at ordinary temperature but not at very low temperature. These are called
a conductor
b insulator
c semiconductor
d dielectric

Answer 1

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Answer 2

Answer:

In semiconductor substance, charge can flow at ordinary temperature but not at very low temperature.

Therefore, the option (c) is correct.

Explanation:

• Their are some solids which have the properties intermediate between the metals and insulators are called semiconductors.
• In metals, the conduction bend is very close to valence band. Therefore, electrons can easily jump from the valence band to the conduction band. So, metals are good conductors.
• In insulators, the energy gap between the valence band and conduction band is very large and therefore, the electrons cannot jump from the valence band into the conduction band. Therefore, their conductivity is very low.
• Semiconductors have small energy difference  between the valence band and conduction band.
• But if the semiconductor substance is cooled at low temperature such as absolute zero. Then the electrons occupy their lowest possible energy  levels. The material would be a perfect insulator.