Question 1

A diatomic quantum mechanical oscillator has a moment of inertia of 7.73 × 10-45 kg∙m2. What is the rotational energy in the quantum state characterized by L = 2?

Accepted Answer

A)  2.27 × 10-5 eV
B)  2.72 × 10-5 eV
C)  5.87 × 10-5 eV
D)  7.22 × 10-5 eV
E)  8.71 × 10-5 eVF) B) and E)
G) None of the above

Question 2

When a p-n junction diode is forward biased

Accepted Answer

A)  a current does not flow through it.
B)  a current flows through it from the p-side to the n-side.
C)  a current flows through it from the n-side to the p-side.
D)  a current flows because holes and electrons are traveling in opposite directions away from the junction.
E)  a current flows because holes and electrons are traveling in the same direction towards the junction.F) B) and D)
G) A) and D)

Question 3

The conductivity of a semiconductor sharply increases when 400 nm (or shorter)  wavelength light is shone upon it. This is consistent with what energy gap for this material?

Accepted Answer

A)  3.6 eV
B)  0.45 eV
C)  2.0 eV
D)  3.1 eV
E)  1.0 eVF) A) and C)
G) B) and D)

Question 4

The bond energy for a hydrogen molecule is

Accepted Answer

A)  1.5 eV.
B)  2.5 eV.
C)  3.5 eV.
D)  4.5 eV.
E)  5.5 eV.F) B) and C)
G) A) and B)

Question 5

Van der Waals bonding is caused by

Accepted Answer

A)  the sharing of electrons between atoms.
B)  the transfer of electrons between atoms.
C)  unequal charge distribution around neutral molecules.
D)  atoms bonding to hydrogen molecules.
E)  atoms bonding to oxygen molecules.F) B) and D)
G) B) and E)

Question 6

Which of the following statements is true?

Accepted Answer

A)  In a p-type doped semiconductor the donor level is close to the valence band.
B)  In an n-type doped semiconductor the acceptor level is close to the valence band.
C)  In a p-type doped semiconductor the acceptor level is close to the valence band.
D)  In an n-type doped semiconductor the donor level is close to the valence band.
E)  None of the statements are true.F) C) and D)
G) All of the above

Question 7

A diatomic quantum mechanical rotator in the L = 1 quantum state has energy E. The same rotator in the L = 2 quantum state will have energy

Accepted Answer

A)  2E.
B)  3E.
C)  6E.
D)  8E.
E)  none of the given answersF) A) and E)
G) All of the above

Question 8

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

Accepted Answer

A)  increases as v increases.
B)  decreases as v increases.
C)  is constant for all values of v.
D)  varies randomly as v increases.E) A) and D)
F) B) and C)

Question 9

If the potential energy diagram, when shown as a function of the separation of the atoms in the molecule, has a positive slope, then the force between the atoms

Accepted Answer

A)  has the highest possible value.
B)  is attractive.
C)  has the lowest possible value.
D)  is repulsive.
E)  is none of the above.F) A) and C)
G) C) and D)

Question 10

Silver has a Fermi level of 5.5 eV. At 0 K, what is the speed of the electrons with the Fermi speed?

Accepted Answer

A)  1.4 × 106 m/s
B)  1100 m/s
C)  2200 m/s
D)  0
E)  1.1 × 106 m/sF) A) and E)
G) A) and D)

Question 11

An unfilled electron state in the valence band is called

Accepted Answer

A)  a hole.
B)  an empty electron.
C)  a conduction electron.
D)  a positron.
E)  an empty positron.F) B) and E)
G) C) and D)

Question 12

The spacing of the atoms in the H2 molecule is 7.4 x 10-11 m. What is the moment of inertia of this molecule about its center of mass?

Accepted Answer

A)  1.5 x 10-47 kg∙ m2
B)  1.9 x 10-47 kg∙ m2
C)  9.1 x 10-48 kg∙ m2
D)  4.6 x 10-48 kg∙ m2
E)  2.3 x 10-48 kg∙vF) None of the above
G) A) and E)

Question 13

An n-type semiconductor is produced by

Accepted Answer

A)  doping the host crystal with donor impurities.
B)  doping the host crystal with accepter impurities.
C)  pure crystals of germanium.
D)  all of the above.
E)  none of the above.F) A) and B)
G) A) and C)

Question 14

In the potential energy diagram of a molecule, the activation energy is the energy that is

Accepted Answer

A)  necessary to get the molecule to form.
B)  above the ground state of the molecule.
C)  released when the molecule is formed.
D)  stored in the molecule.
E)  at the ground state of the molecule.F) B) and E)
G) D) and E)

Question 15

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

Accepted Answer

A)  increases as L increases.
B)  decreases as L increases.
C)  is constant for all L.
D)  varies randomly as L increases.E) All of the above
F) None of the above

Question 16

A p-type semiconductor has a net positive charge.

Accepted Answer

A) True 
 B)False

Exam 40: Molecules and Solids

In the potential energy diagram of a molecule, the activation energy is the energy that is

Correct Answer
verified

A diatomic quantum mechanical rotator in the L = 1 quantum state has energy E. The same rotator in the L = 2 quantum state will have energy

Correct Answer
verified

Silver has a Fermi level of 5.5 eV. At 0 K, what is the speed of the electrons with the Fermi speed?

Correct Answer
verified

Which of the following statements is true?

Correct Answer
verified

The conductivity of a semiconductor sharply increases when 400 nm (or shorter) wavelength light is shone upon it. This is consistent with what energy gap for this material?

Correct Answer
verified

When a p-n junction diode is forward biased

Correct Answer
verified

An unfilled electron state in the valence band is called

Correct Answer
verified

A diatomic quantum mechanical oscillator has a moment of inertia of 7.73 × 10^-⁴⁵ kg∙m². What is the rotational energy in the quantum state characterized by L = 2?

Correct Answer
verified

If the potential energy diagram, when shown as a function of the separation of the atoms in the molecule, has a positive slope, then the force between the atoms

Correct Answer
verified

The bond energy for a hydrogen molecule is

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Van der Waals bonding is caused by

Correct Answer
verified

The spacing of the atoms in the H₂ molecule is 7.4 x 10^-11 m. What is the moment of inertia of this molecule about its center of mass?

Correct Answer
verified

A p-type semiconductor has a net positive charge.

Correct Answer
verified

An n-type semiconductor is produced by

Correct Answer
verified

Exam 40: Molecules and Solids

In the potential energy diagram of a molecule, the activation energy is the energy that is

Correct AnswerverifiedShow Answer

A diatomic quantum mechanical rotator in the L = 1 quantum state has energy E. The same rotator in the L = 2 quantum state will have energy

Correct AnswerverifiedShow Answer

Silver has a Fermi level of 5.5 eV. At 0 K, what is the speed of the electrons with the Fermi speed?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

The conductivity of a semiconductor sharply increases when 400 nm (or shorter) wavelength light is shone upon it. This is consistent with what energy gap for this material?

Correct AnswerverifiedShow Answer

When a p-n junction diode is forward biased

Correct AnswerverifiedShow Answer

An unfilled electron state in the valence band is called

Correct AnswerverifiedShow Answer

A diatomic quantum mechanical oscillator has a moment of inertia of 7.73 × 10-45 kg∙m2. What is the rotational energy in the quantum state characterized by L = 2?

Correct AnswerverifiedShow Answer

If the potential energy diagram, when shown as a function of the separation of the atoms in the molecule, has a positive slope, then the force between the atoms

Correct AnswerverifiedShow Answer

The bond energy for a hydrogen molecule is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Van der Waals bonding is caused by

Correct AnswerverifiedShow Answer

The spacing of the atoms in the H2 molecule is 7.4 x 10-11 m. What is the moment of inertia of this molecule about its center of mass?

Correct AnswerverifiedShow Answer

A p-type semiconductor has a net positive charge.

Correct AnswerverifiedShow Answer

An n-type semiconductor is produced by

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
verified

A diatomic quantum mechanical oscillator has a moment of inertia of 7.73 × 10^-⁴⁵ kg∙m². What is the rotational energy in the quantum state characterized by L = 2?

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

The spacing of the atoms in the H₂ molecule is 7.4 x 10^-11 m. What is the moment of inertia of this molecule about its center of mass?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified