Question 1

The number of values of the orbital quantum number   associated with the principal quantum number n = 3 is:

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  7 
A)  1 
B)  2 
C)  3 
D)  4 
E)  7

Question 2

Five electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by   where nx and ny are integers. In units of (h2/8mL2) the energy of the ground state of the system is

Accepted Answer

A)  0 
B)  10 
C)  19 
D)  24 
E)  48 
A)  0 
B)  10 
C)  19 
D)  24 
E)  48

Question 3

Which of the following is essential for the laser action to occur between two energy levels of an atom?

Accepted Answer

A)  the lower level is metastable 
B)  there are more atoms in the upper level than in the lower level 
C)  there are more atoms in the lower level than in the upper level 
D)  the lower level is the ground state 
E)  the lasing material is a gas 
A)  the lower level is metastable 
B)  there are more atoms in the upper level than in the lower level 
C)  there are more atoms in the lower level than in the upper level 
D)  the lower level is the ground state 
E)  the lasing material is a gas

Question 4

An electron in an atom is in a state with   and   The angle between   and the z axis is:

Accepted Answer

A)  48.2$\degree$ 
B)  60$\degree$ 
C)  30$\degree$ 
D)  35.3$\degree$ 
E)  54.7$\degree$ 
A)  48.2$\degree$ 
B)  60$\degree$ 
C)  30$\degree$ 
D)  35.3$\degree$ 
E)  54.7$\degree$

Question 5

Which of the following   combinations is impossible for an electron in an atom?

Accepted Answer

A)  3, 1, 1, -1/2 
B)  6, 2, 0, 1/2 
C)  3, 2, -2, -1/2 
D)  3, 1, -2, 1/2 
E)  1, 0, 0, -1/2 
A)  3, 1, 1, -1/2 
B)  6, 2, 0, 1/2 
C)  3, 2, -2, -1/2 
D)  3, 1, -2, 1/2 
E)  1, 0, 0, -1/2

Question 6

The Stern-Gerlach experiment makes use of:

Accepted Answer

A)  a strong uniform magnetic field 
B)  a strong non-uniform magnetic field 
C)  a strong uniform electric field 
D)  a strong non-uniform electric field 
E)  strong perpendicular electric and magnetic fields 
A)  a strong uniform magnetic field 
B)  a strong non-uniform magnetic field 
C)  a strong uniform electric field 
D)  a strong non-uniform electric field 
E)  strong perpendicular electric and magnetic fields

Question 7

The minimum energy principle tells us that:

Accepted Answer

A)  the energy of an atom with a high atomic number is less than the energy of an atom with a low atomic number 
B)  the energy of an atom with a low atomic number is less than the energy of an atom with high atomic number 
C)  when an atom makes an upward transition the energy of the absorbed photon is the least possible 
D)  the ground state configuration of any atom is the one with the least energy 
E)  the ground state configuration of any atom is the one with the least ionization energy 
A)  the energy of an atom with a high atomic number is less than the energy of an atom with a low atomic number 
B)  the energy of an atom with a low atomic number is less than the energy of an atom with high atomic number 
C)  when an atom makes an upward transition the energy of the absorbed photon is the least possible 
D)  the ground state configuration of any atom is the one with the least energy 
E)  the ground state configuration of any atom is the one with the least ionization energy

Question 8

An atom is in a state with orbital quantum number   Possible values of the magnetic quantum number   are:

Accepted Answer

A)  1, 2 
B)  0, 1, 2 
C)  0, 1 
D)  -1, 0, 1 
E)  -2, -1, 0, 1, 2 
A)  1, 2 
B)  0, 1, 2 
C)  0, 1 
D)  -1, 0, 1 
E)  -2, -1, 0, 1, 2

Question 9

The states being filled from the beginning to end of the lanthanide series of atoms are:

Accepted Answer

A)  n = 3,   states 
B)  n = 4,   states 
C)  n = 4,   states 
D)  n = 4,   states 
E)  n = 5,   states 
A)  n = 3,   states 
B)  n = 4,   states 
C)  n = 4,   states 
D)  n = 4,   states 
E)  n = 5,   states

Question 10

No state in an atom can be occupied by more than one electron. This is most closely related to the:

Accepted Answer

A)  wave nature of matter 
B)  finite value for the speed of light 
C)  Bohr magneton 
D)  Pauli exclusion principle 
E)  the Einstein-de Haas effect 
A)  wave nature of matter 
B)  finite value for the speed of light 
C)  Bohr magneton 
D)  Pauli exclusion principle 
E)  the Einstein-de Haas effect

Question 11

The electron states in an atom which constitute a single subshell all have:

Accepted Answer

A)  only the same value of n 
B)  only the same value of   
C)  only the same value of n and the same value of   
D)  only the same value of   and the same value of   
E)  the same set of all four quantum numbers 
A)  only the same value of n 
B)  only the same value of   
C)  only the same value of n and the same value of   
D)  only the same value of   and the same value of   
E)  the same set of all four quantum numbers

Question 12

The most energetic photon in a continuous x-ray spectrum has an energy approximately equal to:

Accepted Answer

A)  the energy of all the electrons in a target atom 
B)  the kinetic energy of an incident-beam electron 
C)  the rest energy, mc2, of an electron 
D)  the total energy of a K-electron in the target atom 
E)  the kinetic energy of a K-electron in the target atom 
A)  the energy of all the electrons in a target atom 
B)  the kinetic energy of an incident-beam electron 
C)  the rest energy, mc2, of an electron 
D)  the total energy of a K-electron in the target atom 
E)  the kinetic energy of a K-electron in the target atom

Question 13

Possible values of the principal quantum number n for an electron in an atom are:

Accepted Answer

A)  only 0 and 1 
B)  only 0,1,2,..., $\infty$ 
C)  only 0,1,...,   
D)  only 1/2 and -1/2 
E)  only 1,2,3,..., $\infty$ 
A)  only 0 and 1 
B)  only 0,1,2,..., $\infty$ 
C)  only 0,1,...,   
D)  only 1/2 and -1/2 
E)  only 1,2,3,..., $\infty$

Question 14

Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 * 1020 atoms in the metastable state and 2 * 1020 atoms in the ground state. The number of photons that can be produced in a single burst is about:

Accepted Answer

A)  2 * 1020 
B)  3 * 1020 
C)  4 * 1020 
D)  6 * 1020 
E)  8* 1020 
A)  2 * 1020 
B)  3 * 1020 
C)  4 * 1020 
D)  6 * 1020 
E)  8* 1020

Question 15

In the relation   the quantity $\mu$B is:

Accepted Answer

A)  the Bohr magneton 
B)  the component of the dipole moment along the magnetic field 
C)  the permeability of the material 
D)  a friction coefficient 
E)  none of the above 
A)  the Bohr magneton 
B)  the component of the dipole moment along the magnetic field 
C)  the permeability of the material 
D)  a friction coefficient 
E)  none of the above

Question 16

In connection with x-ray emission the symbol L $\beta$  refers to:

Accepted Answer

A)  a beta particle radiation 
B)  an atomic state of angular momentum h/2 $\pi$ 
C)  the inductance associated with an orbiting electron 
D)  x-radiation associated with an electron going from n = 4 to n = 2 
E)  none of the above 
A)  a beta particle radiation 
B)  an atomic state of angular momentum h/2 $\pi$ 
C)  the inductance associated with an orbiting electron 
D)  x-radiation associated with an electron going from n = 4 to n = 2 
E)  none of the above

Question 17

The most energetic electron in any atom at the beginning of a period of the periodic table is in:

Accepted Answer

A)  an   state 
B)  an   state 
C)  an   state 
D)  an n = 0 state with unspecified angular momentum 
E)  an n = 1 state with unspecified angular momentum 
A)  an   state 
B)  an   state 
C)  an   state 
D)  an n = 0 state with unspecified angular momentum 
E)  an n = 1 state with unspecified angular momentum

Question 18

If electrons did not have intrinsic angular momentum (spin) but still obeyed the Pauli exclusion principle the states occupied by electrons in the ground state of helium would be:

Accepted Answer

A)  (n = 1,   ); (n = 1,   ) 
B)  (n = 1,   ); (n = 1,   ) 
C)  (n = 1,   ); (n = 2,   ) 
D)  (n = 2,   ); (n = 2,   ) 
E)  (n = 2,   ); (n = 2,   ) 
A)  (n = 1,   ); (n = 1,   ) 
B)  (n = 1,   ); (n = 1,   ) 
C)  (n = 1,   ); (n = 2,   ) 
D)  (n = 2,   ); (n = 2,   ) 
E)  (n = 2,   ); (n = 2,   )

Question 19

An electron in an atom is in a state with   The minimum angle between   and the z axis is:

Accepted Answer

A)  0$\degree$ 
B)  18.0$\degree$ 
C)  24.1$\degree$ 
D)  36.7$\degree$ 
E)  33.6$\degree$ 
A)  0$\degree$ 
B)  18.0$\degree$ 
C)  24.1$\degree$ 
D)  36.7$\degree$ 
E)  33.6$\degree$

Question 20

The purpose of the mirrors at the ends of a helium-neon laser is:

Accepted Answer

A)  to assure that no laser light leaks out 
B)  to increase the number of stimulated emissions 
C)  to absorb some of the photons 
D)  to keep the light used for pumping inside the laser 
E)  to double the effective length of the laser 
A)  to assure that no laser light leaks out 
B)  to increase the number of stimulated emissions 
C)  to absorb some of the photons 
D)  to keep the light used for pumping inside the laser 
E)  to double the effective length of the laser

Exam 40: All About Atoms

The number of values of the orbital quantum number associated with the principal quantum number n = 3 is:

Five electrons are in a two-dimensional square potential energy well with sides of length L. The potential energy is infinite at the sides and zero inside. The single-particle energies are given by where nx and ny are integers. In units of (h2/8mL2) the energy of the ground state of the system is

Which of the following is essential for the laser action to occur between two energy levels of an atom?

An electron in an atom is in a state with and The angle between and the z axis is:

Which of the following combinations is impossible for an electron in an atom?

The Stern-Gerlach experiment makes use of:

The minimum energy principle tells us that:

An atom is in a state with orbital quantum number Possible values of the magnetic quantum number are:

The states being filled from the beginning to end of the lanthanide series of atoms are:

No state in an atom can be occupied by more than one electron. This is most closely related to the:

The electron states in an atom which constitute a single subshell all have:

The most energetic photon in a continuous x-ray spectrum has an energy approximately equal to:

Possible values of the principal quantum number n for an electron in an atom are:

Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 * 1020 atoms in the metastable state and 2 * 1020 atoms in the ground state. The number of photons that can be produced in a single burst is about:

In the relation the quantity μ\muμ B is:

In connection with x-ray emission the symbol L β\betaβ refers to:

The most energetic electron in any atom at the beginning of a period of the periodic table is in:

If electrons did not have intrinsic angular momentum (spin) but still obeyed the Pauli exclusion principle the states occupied by electrons in the ground state of helium would be:

An electron in an atom is in a state with The minimum angle between and the z axis is:

The purpose of the mirrors at the ends of a helium-neon laser is:

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Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 * 10²⁰ atoms in the metastable state and 2 * 10²⁰ atoms in the ground state. The number of photons that can be produced in a single burst is about:

In the relation $In the relation the quantity \mu <sub>B</sub> is:$ the quantity $\mu$ _B is:

In connection with x-ray emission the symbol L _$\beta$ refers to: