For the following questions choose the best answer In the di

For the following questions, choose the best answer. In the discussion of the electrical properties of solid materials, what is a band? a collection of closely-spaced energy level\'s a linear defect in the lattice of the solid the paths electrons follow when moving in the solid lines of atoms in the lattice of the solid the class of electrical materials the solid falls into, such as metal, semiconductor, etc. In crystalline solids, there are bands of energy in which there are available states for electrons to occupy What do we call the range of energies in between these bands for which there are no available states? illegal states breaches skips pauses gaps What is the Fermi energy? -13.6 eV the width of the largest band in the solid the energy needed to initiate a current in a metal the average total energy of the electrons within the solid the highest occupied energy level of a solid when its at absolute zero What is the name of the microscopic model that may be used to understand why some materials are metals? comprehensive model Maxwell-Boltzmann model standard model Anderson model free-electron model

Solution

i) Answere is ( e )

Band is the space between energies of valence electrons and conduction electrons.

ii)

Answer is (e)

energy gap

iii) Answer is (e)

The Fermi energy is the energy difference between the highest and lowest occupied single-particle states at absolute zero temperature.

iv)

free electron model