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Light Emitting Diode

Which of the ...

Question

Which of the following theories could not explain completely the behaviour of conductors, insulators, and semiconductors.

A

energy band theory

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B

free electron theory

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C

valence electron theory

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D

None

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Solution

The correct option is B free electron theory
The electrical conductivity of semiconductor and insulator cannot be explained by free electron theory.

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Q. Assertion :In some solids, the valence band is completely filled while the next higher band separated by an energy gap of few electrons-volts is completely empty. Reason: In insulators the energy band completely filled with electrons( the valence band) and above it is empty band (the conduction band)

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In insulators, the valence bands are completely and the large band gap prevents the promotion of electrons to empty space whereas in semiconductor band gap is low.

Q. Choose the correct option to complete the following statement.
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