Question 1

An acceptor replacement atom in silicon might have ______ electrons in its outer shell.

Accepted Answer

A)  3 
B)  4 
C)  5 
D)  6 
E)  7 
A)  3 
B)  4 
C)  5 
D)  6 
E)  7 A

Question 2

If the density of states is N(E) and the occupancy probability is P(E), then the density of unoccupied states is:

Accepted Answer

A)  N(
E)  + P(
E)  
B)  N(
E) /P(
E)  
C)  N(
E)  - P(
E)  
D)  N(
E) P(
E)  
E)  P(
E) /N(
E)  
A)  N(
E)  + P(
E)  
B)  N(
E) /P(
E)  
C)  N(
E)  - P(
E)  
D)  N(
E) P(
E)  
E)  P(
E) /N(
E)  D

Question 3

The occupancy probability for a state with energy equal to the Fermi energy is:

Accepted Answer

A)  0 
B)  0.5 
C)  1 
D)  1.5 
E)  2 
A)  0 
B)  0.5 
C)  1 
D)  1.5 
E)  2 B

Question 4

For a pure semiconductor the Fermi level is:

Accepted Answer

A)  in the conduction band 
B)  well above the conduction band 
C)  in the valence band 
D)  well below the valence band 
E)  near the center of the gap between the valence and conduction bands 
A)  in the conduction band 
B)  well above the conduction band 
C)  in the valence band 
D)  well below the valence band 
E)  near the center of the gap between the valence and conduction bands

Question 5

Ther Fermi energy of a metal depends primarily on:

Accepted Answer

A)  the temperature 
B)  the volume of the sample 
C)  the mass density of the metal 
D)  the size of the sample 
E)  the number density of conduction electrons 
A)  the temperature 
B)  the volume of the sample 
C)  the mass density of the metal 
D)  the size of the sample 
E)  the number density of conduction electrons

Question 6

The number density n of conductions electrons, the resistivity  , and the temperature coefficient of resistivity $\infty$ are given below for five materials.Which is a semiconductor?

Accepted Answer

A)  n = 1029 m-3,    = 10-8 $\Omega$. m, $\infty$ = +10-3 K-1 
B)  n = 1028 m-3,   = 10-9 $\Omega$. m, $\infty$ = -10-3 K-1 
C)  n = 1028 m-3,   = 10-9 $\Omega$ . m, $\infty$ = +10-3 K-1 
D)  n = 1015 m-3,   = 103$\Omega$. m, $\infty$ = -10-2 K-1 
E)  n = 1022 m-3,  = 10-7 $\Omega$.m, $\infty$ = +10-3 K-1 
A)  n = 1029 m-3,    = 10-8 $\Omega$. m, $\infty$ = +10-3 K-1 
B)  n = 1028 m-3,   = 10-9 $\Omega$. m, $\infty$ = -10-3 K-1 
C)  n = 1028 m-3,   = 10-9 $\Omega$ . m, $\infty$ = +10-3 K-1 
D)  n = 1015 m-3,   = 103$\Omega$. m, $\infty$ = -10-2 K-1 
E)  n = 1022 m-3,  = 10-7 $\Omega$.m, $\infty$ = +10-3 K-1

Question 7

For a metal at absolute temperature T, with Fermi energy EF, the occupancy probability is given by:

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 8

A donor replacement atom in silicon might have ______ electrons in its outer shell.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 9

The Fermi-Dirac probability function P(E) varies between:

Accepted Answer

A)  0 and 1 
B)  0 and infinity 
C)  1 and infinity 
D)  -1 and 1 
E)  0 and EF  
A)  0 and 1 
B)  0 and infinity 
C)  1 and infinity 
D)  -1 and 1 
E)  0 and EF

Question 10

When a forward bias is applied to a p-n junction the concentration of electrons on the p side:

Accepted Answer

A)  increases slightly 
B)  increases dramatically 
C)  decreases slightly 
D)  decreases dramatically 
E)  does not change 
A)  increases slightly 
B)  increases dramatically 
C)  decreases slightly 
D)  decreases dramatically 
E)  does not change

Question 11

A hole refers to:

Accepted Answer

A)  a proton 
B)  a positively charged electron 
C)  an electron which has somehow lost its charge 
D)  a microscopic defect in a solid 
E)  the absence of an electron in an otherwise filled band 
A)  a proton 
B)  a positively charged electron 
C)  an electron which has somehow lost its charge 
D)  a microscopic defect in a solid 
E)  the absence of an electron in an otherwise filled band

Question 12

The density of states for a metal depends primarily on:

Accepted Answer

A)  the temperature 
B)  the energy associated with the state 
C)  the density of the metal 
D)  the volume of the sample 
E)  none of these 
A)  the temperature 
B)  the energy associated with the state 
C)  the density of the metal 
D)  the volume of the sample 
E)  none of these

An acceptor replacement atom in silicon might have ______ electrons in its outer shell.

If the density of states is N(E) and the occupancy probability is P(E), then the density of unoccupied states is:

The occupancy probability for a state with energy equal to the Fermi energy is:

For a pure semiconductor the Fermi level is:

Ther Fermi energy of a metal depends primarily on:

For a metal at absolute temperature T, with Fermi energy E_F, the occupancy probability is given by:

A donor replacement atom in silicon might have ______ electrons in its outer shell.

The Fermi-Dirac probability function P(E) varies between:

When a forward bias is applied to a p-n junction the concentration of electrons on the p side:

A hole refers to:

The density of states for a metal depends primarily on:

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Exam 23: Conduction of Electricity in Solids

An acceptor replacement atom in silicon might have ______ electrons in its outer shell.

If the density of states is N(E) and the occupancy probability is P(E), then the density of unoccupied states is:

The occupancy probability for a state with energy equal to the Fermi energy is:

For a pure semiconductor the Fermi level is:

Ther Fermi energy of a metal depends primarily on:

The number density n of conductions electrons, the resistivity , and the temperature coefficient of resistivity ∞\infty∞ are given below for five materials.Which is a semiconductor?

For a metal at absolute temperature T, with Fermi energy EF, the occupancy probability is given by:

A donor replacement atom in silicon might have ______ electrons in its outer shell.

The Fermi-Dirac probability function P(E) varies between:

When a forward bias is applied to a p-n junction the concentration of electrons on the p side:

A hole refers to:

The density of states for a metal depends primarily on:

Vectors and Mesurement

Gravitation, Force, Motion, Equilibrium, Elasticity, Rotation, Center of Mass, Linear Momentum, Potential Eneray, Conservation of Energy, Kinetic Energy, Work, Rolling, Torque, and Angular Momentum

Oscillations, Fluids, Waves, Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Coulombs Law

Electric Fields

Electric Potential and Gauss Law

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations: Magnetism of Matter

Electromagnetic Waves

Images

Diffract and Interference

Relativity

More About Matter Waves, Photons and Matter Waves

All About Atoms

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

For a metal at absolute temperature T, with Fermi energy E_F, the occupancy probability is given by: