In a semiconductor,
(a) there are no free electrons at 0 K
(b) there are no free electrons at any temperature
(c) the number of free electrons increases with temperature
(d) the number of free electrons is less than that in a conductor.
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Answer:
the number of free electron is less than that in the conductor
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In a semiconductor, there are no free electrons at 0 K,the number of free electrons increases with temperature and the number of free electrons is less than that in a conductor.
Explanation:
- At 0 K, the valence band is full in semiconductors, but there is emptiness in the conduction band. Therefore, for the conduction at 0 K, there will not be any available free electrons.
- When there is an increase in the temperature, the covalent bonds break, which for the purpose of conduction offers free charge carriers.
- In metals, the conduction hand is partially filled at 0 K already. Below the Fermi level, many free electrons take the energy from temperature of an external source and behave like free electron after jumping to the conduction band.
- Therefore, more than the semiconductors, metals contain more free electrons.
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