How can electrons be promoted from the valence band to the conductance band of a
ID: 1075849 • Letter: H
Question
How can electrons be promoted from the valence band to the conductance band of a solid?
options:
By adding heat to the solid.
By shining light that is less energetic than the band gap energy on the solid.
By treating the solid with a chemical oxidizing agent.
More than one of these processes will promote electrons from the valence band to the conductance band.
A.By adding heat to the solid.
B.By shining light that is less energetic than the band gap energy on the solid.
C.By treating the solid with a chemical oxidizing agent.
D.More than one of these processes will promote electrons from the valence band to the conductance band.
Explanation / Answer
The difference between the valence band and the conduction band is called Fermi level. Electrons cannot be promoted from the valence band to the conductance band of a solid by shining light that is less energetic than the band gap energy on the solid. Also, electrons cannot be promoted from the valence band to the conductance band of a solid by treating the solid with a chemical oxidizing agent. Here, the only way to promote electrons across the Fermi level is by adding heat to the solid.
The answer is A) By adding heat to the solid.
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