Question 1

The Fermi energy corresponds to:

Accepted Answer

A) the maximum energy electrons can have in a metal at T = 0 K. 
B) the maximum energy electrons can have in a metal at T = 0 C. 
C) the minimum energy electrons can have in a metal at T = 0 K. 
D) the number of electrons per unit volume between E and E + dE. 
E) the minimum energy electrons can have in a metal at T = 0 C. 
A) the maximum energy electrons can have in a metal at T = 0 K. 
B) the maximum energy electrons can have in a metal at T = 0 C. 
C) the minimum energy electrons can have in a metal at T = 0 K. 
D) the number of electrons per unit volume between E and E + dE. 
E) the minimum energy electrons can have in a metal at T = 0 C.

Question 2

When a voltage$\Delta$V is applied to a p-n junction diode at absolute temperature T, the current voltage relationship is:

Accepted Answer

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

Question 3

An LED emits light of wavelength 600 nm.What is its band gap?

Accepted Answer

A) 1.11 eV 
B) 1.54 eV 
C) 1.99 eV 
D) 2.07 eV 
E) 2.33 eV 
A) 1.11 eV 
B) 1.54 eV 
C) 1.99 eV 
D) 2.07 eV 
E) 2.33 eV

Question 4

An experiment determines that there are 49 allowed rotational energies for a diatomic molecule whose moment of inertia is 2 *0 10-46 kg .m2.The maximum rotational kinetic energy (in eV) is:

Accepted Answer

A) 0.6 
B) 0.2 
C) 0.4 
D) 0.8 
E) 1.0 
A) 0.6 
B) 0.2 
C) 0.4 
D) 0.8 
E) 1.0

Question 5

Ellis and Randy are looking at a molecular absorption spectrum.The spectral lines appear to fall into two groups with a gap in the middle.Ellis says that this must be an absorption spectrum for transitions between the v = 0 and v = 1 vibrational states of a diatomic molecule.Randy says the gap in the middle must occur because a $\Delta$J = 0 transition is forbidden.Which one, if either, is correct, and why?

Accepted Answer

A) Ellis, because rotational levels are separated by greater energy differences than vibrational levels. 
B) Randy, because rotational levels are separated by greater energy differences than vibrational levels. 
C) Ellis, because the $\Delta$J = 0 transition is the most prominent spectral line in transitions between vibrational levels. 
D) Neither, because rotational levels are separated by greater energies that vibrational levels and $\Delta$J = 0 transitions are not forbidden. 
E) Both, because vibrational levels are separated by greater energy differences than rotational levels and $\Delta$J = 0 transitions are forbidden. 
A) Ellis, because rotational levels are separated by greater energy differences than vibrational levels. 
B) Randy, because rotational levels are separated by greater energy differences than vibrational levels. 
C) Ellis, because the $\Delta$J = 0 transition is the most prominent spectral line in transitions between vibrational levels. 
D) Neither, because rotational levels are separated by greater energies that vibrational levels and $\Delta$J = 0 transitions are not forbidden. 
E) Both, because vibrational levels are separated by greater energy differences than rotational levels and $\Delta$J = 0 transitions are forbidden.

Question 6

Which of the following refer to the basic categories associated with the energy of a single molecule in a gaseous phase?

Accepted Answer

A) nuclear, electronic, interval 
B) electronic, translation, rotation, vibration 
C) ionic, covalent, hydrogen, Van der Waals 
D) translation, rotation, vibration 
E) dipole-dipole, covalent, ionic, translation 
A) nuclear, electronic, interval 
B) electronic, translation, rotation, vibration 
C) ionic, covalent, hydrogen, Van der Waals 
D) translation, rotation, vibration 
E) dipole-dipole, covalent, ionic, translation

The Fermi energy corresponds to:

When a voltage $\Delta$ V is applied to a p-n junction diode at absolute temperature T, the current voltage relationship is:

An LED emits light of wavelength 600 nm.What is its band gap?

An experiment determines that there are 49 allowed rotational energies for a diatomic molecule whose moment of inertia is 2 *0 10-46 kg .m2.The maximum rotational kinetic energy (in eV) is:

Which of the following refer to the basic categories associated with the energy of a single molecule in a gaseous phase?

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Nuclei and Radioactivity

Particle Physics

Filters

Exam 20: Quantum Physics of Molecules and Solids

The Fermi energy corresponds to:

When a voltage Δ\DeltaΔ V is applied to a p-n junction diode at absolute temperature T, the current voltage relationship is:

An LED emits light of wavelength 600 nm.What is its band gap?

An experiment determines that there are 49 allowed rotational energies for a diatomic molecule whose moment of inertia is 2 *0 10-46 kg .m2.The maximum rotational kinetic energy (in eV) is:

Which of the following refer to the basic categories associated with the energy of a single molecule in a gaseous phase?

Electric Fields

Gausss Law

Electric Potential

Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Magnetic Forces

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarisation

Quantisation and Wave-Particle Duality

Introduction to Quantum Mechanics

Atomic Physics

Nuclei and Radioactivity

Particle Physics

Filters

When a voltage $\Delta$ V is applied to a p-n junction diode at absolute temperature T, the current voltage relationship is: