Question 1

A p-type semiconductor is produced by

Accepted Answer

A)  doping the host crystal with acceptor impurities. 
B)  pure crystals of germanium. 
C)  doping the host crystal with donor impurities. 
A)  doping the host crystal with acceptor impurities. 
B)  pure crystals of germanium. 
C)  doping the host crystal with donor impurities. A

Question 2

A diatomic molecule has $18 \times 10 ^ { - 5 } \mathrm { eV }$ of rotational energy in the $L = 2$ quantum state. What is its rotational energy in the $L = 0$ quantum state? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

Accepted Answer

A)  $6.0 \times 10 ^ { - 5 } \mathrm { eV }$ 
B)  $9.0 \times 10 ^ { - 5 } \mathrm { eV }$ 
C)  $0 \mathrm { eV }$ 
D)  $3.0 \times 10 ^ { - 5 } \mathrm { eV }$ 
A)  $6.0 \times 10 ^ { - 5 } \mathrm { eV }$ 
B)  $9.0 \times 10 ^ { - 5 } \mathrm { eV }$ 
C)  $0 \mathrm { eV }$ 
D)  $3.0 \times 10 ^ { - 5 } \mathrm { eV }$ C

Question 3

For a diatomic quantum mechanical vibrator, the energy difference between adjacent quantum states

Accepted Answer

A)  varies randomly as the integer v increases. 
B)  increases as the integer v increases. 
C)  decreases as the integer v increases. 
D)  is constant for all values of the integer v. 
A)  varies randomly as the integer v increases. 
B)  increases as the integer v increases. 
C)  decreases as the integer v increases. 
D)  is constant for all values of the integer v. D

Question 4

A diatomic molecule is vibrating in the $v = 1$ quantum state with a frequency of $2.0 \times 10 ^ { 13 } \mathrm {~Hz}$. What is its vibrational energy? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

Accepted Answer

A)  $0.12 \mathrm { eV }$ 
B)  $0.041 \mathrm { eV }$ 
C)  $0.083 \mathrm { eV }$ 
D)  $0.17 \mathrm { eV }$ 
A)  $0.12 \mathrm { eV }$ 
B)  $0.041 \mathrm { eV }$ 
C)  $0.083 \mathrm { eV }$ 
D)  $0.17 \mathrm { eV }$

Question 5

Estimate the maximum rotational energy (in electron-volts) for a free and freely-spinning diatomic hydrogen molecule in the $L = 2$ quantum state. The equilibrium separation for the atoms in the $\mathrm { H } _ { 2 }$ molecule is $0.075 \mathrm {~nm} . \left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , m _ { \text {proton } } = 1.67 \times 10 ^ { - 27 } \mathrm {~kg} , h = 6.626 \times 10 ^ { - 34 } \right.$ J.s)

Accepted Answer

A)  $0.033 \mathrm { eV }$ 
B)  $0.011 \mathrm { eV }$ 
C)  $0.044 \mathrm { eV }$ 
D)  $0.022 \mathrm { eV }$ 
A)  $0.033 \mathrm { eV }$ 
B)  $0.011 \mathrm { eV }$ 
C)  $0.044 \mathrm { eV }$ 
D)  $0.022 \mathrm { eV }$

Question 6

A diatomic molecule has $2.6 \times 10 ^ { - 5 } \mathrm { eV }$ of rotational energy in the $L = 2$ quantum state. What is its rotational energy in the $L = 1$ quantum state? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

Accepted Answer

A)  $3.4 \times 10 ^ { - 6 } \mathrm { eV }$ 
B)  $5.3 \times 10 ^ { - 6 } \mathrm { eV }$ 
C)  $8.7 \times 10 ^ { - 6 } \mathrm { eV }$ 
D)  $7.8 \times 10 ^ { - 6 } \mathrm { eV }$ 
A)  $3.4 \times 10 ^ { - 6 } \mathrm { eV }$ 
B)  $5.3 \times 10 ^ { - 6 } \mathrm { eV }$ 
C)  $8.7 \times 10 ^ { - 6 } \mathrm { eV }$ 
D)  $7.8 \times 10 ^ { - 6 } \mathrm { eV }$

Question 7

If a battery is connected to a diode with the positive terminal to the p side and the negative terminal to the n side, then diode is said to be

Accepted Answer

A)  forward biased. 
B)  reversed biased. 
C)  Neither choice is correct. 
A)  forward biased. 
B)  reversed biased. 
C)  Neither choice is correct.

Question 8

In its lowest quantum state, a diatomic quantum mechanical rotator has a rotational energy of

Accepted Answer

A)  $\frac { \hbar ^ { 2 } } { 2 I }$ 
B)  $\frac { \hbar ^ { 2 } } { I } .$ 
C)  zero. 
D)  none of the given answers. 
A)  $\frac { \hbar ^ { 2 } } { 2 I }$ 
B)  $\frac { \hbar ^ { 2 } } { I } .$ 
C)  zero. 
D)  none of the given answers.

Question 9

In a p-type semiconductor, a hole is

Accepted Answer

A)  a missing atom in the crystalline structure. 
B)  an extra electron supplied by a donor atom. 
C)  a donor atom. 
D)  a region where an electron is missing. 
A)  a missing atom in the crystalline structure. 
B)  an extra electron supplied by a donor atom. 
C)  a donor atom. 
D)  a region where an electron is missing.

Question 10

The energy gap between the valence and conduction bands in a certain semiconductor is $1.25 \mathrm { eV }$. What is the threshold wavelength for optical absorption in this substance? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = \right.$ $6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s }$ )

Accepted Answer

A)  $994 \mathrm {~nm}$ 
B)  $873 \mathrm {~nm}$ 
C)  $599 \mathrm {~nm}$ 
D)  $959 \mathrm {~nm}$ 
A)  $994 \mathrm {~nm}$ 
B)  $873 \mathrm {~nm}$ 
C)  $599 \mathrm {~nm}$ 
D)  $959 \mathrm {~nm}$

Question 11

An n-type semiconductor is produced by

Accepted Answer

A)  pure crystals of germanium. 
B)  doping the host crystal with acceptor impurities. 
C)  doping the host crystal with donor impurities. 
A)  pure crystals of germanium. 
B)  doping the host crystal with acceptor impurities. 
C)  doping the host crystal with donor impurities.

Question 12

A diatomic quantum mechanical oscillator has a moment of inertia of $7.73 \times 10 ^ { - 45 } \mathrm {~kg} \cdot \mathrm { m } ^ { 2 }$. What is the rotational energy when it is in the quantum state characterized by $L = 2$ ? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \right.$ $\left. \mathrm { J } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

Accepted Answer

A)  $8.71 \times 10 ^ { - 5 } \mathrm { eV }$ 
B)  $2.27 \times 10 ^ { - 5 } \mathrm { eV }$ 
C)  $2.70 \times 10 ^ { - 5 } \mathrm { eV }$ 
D)  $7.22 \times 10 ^ { - 5 } \mathrm { eV }$ 
A)  $8.71 \times 10 ^ { - 5 } \mathrm { eV }$ 
B)  $2.27 \times 10 ^ { - 5 } \mathrm { eV }$ 
C)  $2.70 \times 10 ^ { - 5 } \mathrm { eV }$ 
D)  $7.22 \times 10 ^ { - 5 } \mathrm { eV }$

Question 13

A simple junction transistor consists of three semiconductor sections consisting of

Accepted Answer

A)  only pnp semiconductors. 
B)  either pnp or npn semiconductors. 
C)  only npn semiconductors. 
D)  none of the given combinations. 
A)  only pnp semiconductors. 
B)  either pnp or npn semiconductors. 
C)  only npn semiconductors. 
D)  none of the given combinations.

Question 14

Covalent bonding is due to

Accepted Answer

A)  atoms bonding to hydrogen molecules. 
B)  the sharing of electrons between atoms. 
C)  the transfer of electrons between atoms. 
D)  unequal charge distributions around neutral molecules. 
A)  atoms bonding to hydrogen molecules. 
B)  the sharing of electrons between atoms. 
C)  the transfer of electrons between atoms. 
D)  unequal charge distributions around neutral molecules.

Question 15

Metallic bonding is due to

Accepted Answer

A)  the sharing of electrons by all atoms. 
B)  atoms bonding to hydrogen molecules. 
C)  the transfer of electrons between atoms. 
D)  unequal charge distributions around neutral molecules. 
A)  the sharing of electrons by all atoms. 
B)  atoms bonding to hydrogen molecules. 
C)  the transfer of electrons between atoms. 
D)  unequal charge distributions around neutral molecules.

Question 16

Ionic bonding is due to

Accepted Answer

A)  the transfer of electrons between atoms. 
B)  the sharing of electrons between atoms. 
C)  atoms bonding to hydrogen molecules. 
D)  unequal charge distributions around neutral molecules. 
A)  the transfer of electrons between atoms. 
B)  the sharing of electrons between atoms. 
C)  atoms bonding to hydrogen molecules. 
D)  unequal charge distributions around neutral molecules.

Question 17

In a good insulator, the highest energy band containing electrons, called the valence band, is

Accepted Answer

A)  completely filled. 
B)  only partially filled. 
C)  completely empty. 
A)  completely filled. 
B)  only partially filled. 
C)  completely empty.

Question 18

In a good conductor, the highest energy band containing electrons is

Accepted Answer

A)  completely empty. 
B)  only partially filled. 
C)  completely filled. 
A)  completely empty. 
B)  only partially filled. 
C)  completely filled.

Question 19

For a diatomic quantum mechanical rotator, the energy difference between adjacent energy levels

Accepted Answer

A)  decreases as L increases. 
B)  is constant for all L. 
C)  increases as L increases. 
D)  varies randomly as L increases. 
A)  decreases as L increases. 
B)  is constant for all L. 
C)  increases as L increases. 
D)  varies randomly as L increases.

Question 20

When a voltage is applied across a p-type semiconductor, the holes

Accepted Answer

A)  do not move. 
B)  are destroyed. 
C)  move toward the negative electrode. 
D)  move toward the positive electrode. 
A)  do not move. 
B)  are destroyed. 
C)  move toward the negative electrode. 
D)  move toward the positive electrode.

Exam 29: Molecules and Solids

A p-type semiconductor is produced by

For a diatomic quantum mechanical vibrator, the energy difference between adjacent quantum states

If a battery is connected to a diode with the positive terminal to the p side and the negative terminal to the n side, then diode is said to be

In its lowest quantum state, a diatomic quantum mechanical rotator has a rotational energy of

In a p-type semiconductor, a hole is

An n-type semiconductor is produced by

A simple junction transistor consists of three semiconductor sections consisting of

Covalent bonding is due to

Metallic bonding is due to

Ionic bonding is due to

In a good insulator, the highest energy band containing electrons, called the valence band, is

In a good conductor, the highest energy band containing electrons is

For a diatomic quantum mechanical rotator, the energy difference between adjacent energy levels

When a voltage is applied across a p-type semiconductor, the holes

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