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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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In a conductor, the energy gap between valence and conduction bands is _____.
Large
Very large
Very small
None of the above
Very small
In a conductor, the energy bands (valence and conduction bands) overlap, which means there is effectively no energy gap (or a zero energy gap). Because there is no forbidden gap, electrons move freely from the valence band to the conduction band under the influence of an electric field.
In a conductor, the energy bands (valence and conduction bands) overlap, which means there is effectively no energy gap (or a zero energy gap). Because there is no forbidden gap, electrons move freely from the valence band to the conduction band under the influence of an electric field.
Eg=0 eV — Energy gap value for conductors due to band overlap.
According to the Band Theory of Solids, the electrical behavior of a material is determined by the overlap of its energy bands. In conductors, the valence band and conduction band overlap, meaning electrons exist in the conduction band at 0 K without requiring thermal activation. This high availability of free electrons facilitates high electrical conductivity.
Conductors have no forbidden energy gap.
The valence band and conduction band overlap significantly.
Free electrons are abundant even at absolute zero temperature.
High conductivity is a direct result of the lack of a forbidden gap.
Extremely high electrical conductivity.
Low resistivity.
High susceptibility to short circuits.
Cannot be used to build switching devices like transistors directly without modification.
Electrical power transmission cables.
Printed circuit board (PCB) traces.
For semiconductors, the gap is typically around 1 eV (e.g., 1.1 eV for Silicon).
For insulators, the gap is typically >5 eV.
C is correct — Conductors exhibit an overlap between the valence and conduction bands, resulting in a forbidden energy gap of zero.
Remember: Insulators have large gaps (>5 eV), Semiconductors have small gaps (sim1 eV), and Conductors have overlapping bands (Eg=0).