Question 1

The force exerted on a magnetic dipole as it moves with velocity through a Stern-Gerlach apparatus is:

Accepted Answer

A)  proportional to v 
B)  proportional to 1/v 
C)  zero 
D)  proportional to v2 
E)  independent of v 
A)  proportional to v 
B)  proportional to 1/v 
C)  zero 
D)  proportional to v2 
E)  independent of v

Question 2

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

Accepted Answer

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

Question 3

An electron in an atom is in a state with ℓ=3 and mℓ =2. The angle between and the z axis is:

Accepted Answer

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

Question 4

The transition shown gives rise to an x-ray. The correct label for this is:

Accepted Answer

A)  K $\alpha$ 
B)  K $\beta$ 
C)  L $\alpha$ 
D)  L $\beta$ 
E)  KL 
A)  K $\alpha$ 
B)  K $\beta$ 
C)  L $\alpha$ 
D)  L $\beta$ 
E)  KL

Question 5

In the relation µz=−mℓµB, the quantity $\mu$0B 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 6

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. The number of single-particle states with energy 5(h2/8mL2) is:

Accepted Answer

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

Question 7

The K $\infty$  x rays arising from a cobalt (Z = 27) target have a wavelength of about 179 pm. The atomic number of a target that gives rise to K $\infty$ x rays with a wavelength one-third as great ($\approx$60pm) is:

Accepted Answer

A)  Z = 9 
B)  Z = 26 
C)  Z = 28 
D)  Z = 46 
E)  Z = 81 
A)  Z = 9 
B)  Z = 26 
C)  Z = 28 
D)  Z = 46 
E)  Z = 81

Question 8

An electron is in a quantum state for which there are seven allowed values of the z component of the angular momentum. The magnitude of the angular momentum is:

Accepted Answer

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

Question 9

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

Accepted Answer

A)  n = 3, ℓ=2 states 
B)  n = 4, ℓ=1 states 
C)  n = 4, ℓ=2 states 
D)  n = 4, ℓ=3 states 
E)  n = 5, ℓ=2 states 
A)  n = 3, ℓ=2 states 
B)  n = 4, ℓ=1 states 
C)  n = 4, ℓ=2 states 
D)  n = 4, ℓ=3 states 
E)  n = 5, ℓ=2 states

Question 10

The magnitude of the spin magnetic dipole moment of an atom is ( $\degree$B is the Bohr magneton, and s is a positive number):

Accepted Answer

A)   $\degree$B 
B)   $\degree$B s 
C)    
D)    
E)  2 $\degree$B s 
A)   $\degree$B 
B)   $\degree$B s 
C)    
D)    
E)  2 $\degree$B s

Question 11

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

Accepted Answer

A)  an ℓ=0 state 
B)  an ℓ=1 state 
C)  an ℓ=2 state 
D)  an n = 0 state with unspecified angular momentum 
E)  an n = 1 state with unspecified angular momentum 
A)  an ℓ=0 state 
B)  an ℓ=1 state 
C)  an ℓ=2 state 
D)  an n = 0 state with unspecified angular momentum 
E)  an n = 1 state with unspecified angular momentum

Question 12

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

Accepted Answer

A)  an ℓ=0 state 
B)  an ℓ=1 state 
C)  an ℓ=2 state 
D)  an n = 0 state with unspecified angular momentum 
E)  an n = 1 state with unspecified angular momentum 
A)  an ℓ=0 state 
B)  an ℓ=1 state 
C)  an ℓ=2 state 
D)  an n = 0 state with unspecified angular momentum 
E)  an n = 1 state with unspecified angular momentum

Question 13

The number of values of the orbital quantum number ℓ 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 14

The ionization energy of an atom in its ground state is:

Accepted Answer

A)  the energy required to remove the least energetic electron 
B)  the energy required to remove the most energetic electron 
C)  the energy difference between the most energetic electron and the least energetic electron 
D)  the same as the energy of a K $\alpha$  photon 
E)  the same as the excitation energy of the most energetic electron 
A)  the energy required to remove the least energetic electron 
B)  the energy required to remove the most energetic electron 
C)  the energy difference between the most energetic electron and the least energetic electron 
D)  the same as the energy of a K $\alpha$  photon 
E)  the same as the excitation energy of the most energetic electron

Question 15

Six 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. If a seventh electron is added to the system when it is in its ground state the least energy the additional electron can have is:

Accepted Answer

A)  2 (h2/8mL2) 
B)  5 (h2/8mL2) 
C)  8 (h2/8mL2) 
D)  10 (h2/8mL2) 
E)  13 (h2/8mL2) 
A)  2 (h2/8mL2) 
B)  5 (h2/8mL2) 
C)  8 (h2/8mL2) 
D)  10 (h2/8mL2) 
E)  13 (h2/8mL2)

Question 16

The magnetic quantum number mℓ is most closely associated with what property of the electron in an atom?

Accepted Answer

A)  Magnitude of the orbital angular momentum 
B)  Energy 
C)  z component of the spin angular momentum 
D)  z component of the orbital angular momentum 
E)  Radius of the orbit 
A)  Magnitude of the orbital angular momentum 
B)  Energy 
C)  z component of the spin angular momentum 
D)  z component of the orbital angular momentum 
E)  Radius of the orbit

Question 17

An electron in an atom is in a state with ℓ=5. The minimum angle between and the z axis is:

Accepted Answer

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

Question 18

In connection with x-ray emission the symbol K $\alpha$  refers to:

Accepted Answer

A)  an alpha particle radiation 
B)  an effect of the dielectric constant on energy levels 
C)  x-ray radiation from potassium 
D)  x-ray radiation associated with an electron going from n = $\infty$ to n = 1 
E)  x-ray radiation associated with an electron going from n = 2 to n = 1 
A)  an alpha particle radiation 
B)  an effect of the dielectric constant on energy levels 
C)  x-ray radiation from potassium 
D)  x-ray radiation associated with an electron going from n = $\infty$ to n = 1 
E)  x-ray radiation associated with an electron going from n = 2 to n = 1

Question 19

The group of atoms at the beginning of periods of the periodic table is called:

Accepted Answer

A)  alkali metal atoms 
B)  rare earth atoms 
C)  transition metal atoms 
D)  alkaline atoms 
E)  noble gas atoms 
A)  alkali metal atoms 
B)  rare earth atoms 
C)  transition metal atoms 
D)  alkaline atoms 
E)  noble gas atoms

Exam 40: All About Atoms

The force exerted on a magnetic dipole as it moves with velocity through a Stern-Gerlach apparatus is:

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

An electron in an atom is in a state with ℓ=3 and mℓ =2. The angle between and the z axis is:

The transition shown gives rise to an x-ray. The correct label for this is:

In the relation µz=−mℓµB, the quantity μ\muμ 0B is:

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. The number of single-particle states with energy 5(h2/8mL2) is:

The K ∞\infty∞ x rays arising from a cobalt (Z = 27) target have a wavelength of about 179 pm. The atomic number of a target that gives rise to K ∞\infty∞ x rays with a wavelength one-third as great ( ≈\approx≈ 60pm) is:

An electron is in a quantum state for which there are seven allowed values of the z component of the angular momentum. The magnitude of the angular momentum is:

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

The magnitude of the spin magnetic dipole moment of an atom is ( °\degree° B is the Bohr magneton, and s is a positive number):

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

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

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

The ionization energy of an atom in its ground state is:

The magnetic quantum number mℓ is most closely associated with what property of the electron in an atom?

An electron in an atom is in a state with ℓ=5. The minimum angle between and the z axis is:

In connection with x-ray emission the symbol K α\alphaα refers to:

The group of atoms at the beginning of periods of the periodic table is called:

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An electron in an atom is in a state with ℓ=3 and m_ℓ =2. The angle between and the z axis is:

In the relation µ_z=−m_ℓµ_B, the quantity $\mu$ 0_B is:

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 n_x and n_y are integers. The number of single-particle states with energy 5(h²/8mL²) is:

The K _$\infty$ x rays arising from a cobalt (Z = 27) target have a wavelength of about 179 pm. The atomic number of a target that gives rise to K _$\infty$ x rays with a wavelength one-third as great ( $\approx$ 60pm) is:

The magnitude of the spin magnetic dipole moment of an atom is ( $\degree$ _B is the Bohr magneton, and s is a positive number):

The magnetic quantum number m_ℓis most closely associated with what property of the electron in an atom?

In connection with x-ray emission the symbol K _$\alpha$ refers to: