Question 1

Photons in a laser beam are produced by:

Accepted Answer

A) transitions from a metastable state 
B) transitions from a state that decays rapidly 
C) splitting of other photons 
D) pumping 
E) reflection from mirrors 
A) transitions from a metastable state 
B) transitions from a state that decays rapidly 
C) splitting of other photons 
D) pumping 
E) reflection from mirrors

Question 2

The Einstein-de Haas experiment showed that:

Accepted Answer

A) atoms emit and absorb light, but only of certain wavelengths. 
B) atoms have momentum, and momentum is conserved. 
C) atoms have electric fields, and electric fields can cause their energy levels to split. 
D) atoms have magnetic dipole moments that are coupled to their angular momentum. 
E) a gradient in a magnetic field will cause a beam of atoms to split. 
A) atoms emit and absorb light, but only of certain wavelengths. 
B) atoms have momentum, and momentum is conserved. 
C) atoms have electric fields, and electric fields can cause their energy levels to split. 
D) atoms have magnetic dipole moments that are coupled to their angular momentum. 
E) a gradient in a magnetic field will cause a beam of atoms to split.

Question 3

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 4

A laser must be pumped to achieve:

Accepted Answer

A) a metastable state 
B) fast response 
C) stimulated emission 
D) population inversion 
E) the same wavelength for all photons 
A) a metastable state 
B) fast response 
C) stimulated emission 
D) population inversion 
E) the same wavelength for all photons

Question 5

The quantity Lz is related to the quantum number mℓ by:

Accepted Answer

A) Lz = mℓ 
B) Lz = mℓ   
  
C) Lz = mℓ   
  
D) Lz =   
E) Lz =   
A) Lz = mℓ 
B) Lz = mℓ   
  
C) Lz = mℓ   
  
D) Lz =   
E) Lz =

Question 6

For any atom other that hydrogen and helium all electrons in the same shell have:

Accepted Answer

A) the same energy 
B) the same magnitude of angular momentum 
C) the same magnetic quantum number 
D) the same spin quantum number 
E) none of the above 
A) the same energy 
B) the same magnitude of angular momentum 
C) the same magnetic quantum number 
D) the same spin quantum number 
E) none of the above

Question 7

The magnitude of the orbital magnetic dipole moment   of an atom is ($\mu$B is the Bohr magneton, and   is a positive integer):

Accepted Answer

A) "$\mu$B" 
B) "$\mu$B " 
C) "$\mu$B  
 " 
D) "$\mu$B ( +1)" 
E) "$\mu$B  2" 
A) "$\mu$B" 
B) "$\mu$B " 
C) "$\mu$B  
 " 
D) "$\mu$B ( +1)" 
E) "$\mu$B  2"

Question 8

Space quantization means that:

Accepted Answer

A) space is quantized 
B) Lz can have only certain discrete values 
C)    and
  are in the same direction 
D)    and
  are in opposite directions 
E) an electron has a magnetic dipole moment 
A) space is quantized 
B) Lz can have only certain discrete values 
C)    and
  are in the same direction 
D)    and
  are in opposite directions 
E) an electron has a magnetic dipole moment

Question 9

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, ℓ=0); (n = 1, ℓ=0) 
B) (n = 1, ℓ=0); (n = 1, ℓ=1) 
C) (n = 1, ℓ=0); (n = 2, ℓ=0) 
D) (n = 2, ℓ=0); (n = 2, ℓ=1) 
E) (n = 2, ℓ=1); (n = 2, ℓ=1) 
A) (n = 1, ℓ=0); (n = 1, ℓ=0) 
B) (n = 1, ℓ=0); (n = 1, ℓ=1) 
C) (n = 1, ℓ=0); (n = 2, ℓ=0) 
D) (n = 2, ℓ=0); (n = 2, ℓ=1) 
E) (n = 2, ℓ=1); (n = 2, ℓ=1)

Question 10

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because:

Accepted Answer

A) each is produced in an emission that is stimulated by another 
B) all come from the same atom 
C) the lasing material has only two quantum states 
D) all photons are alike, no matter what their source 
E) none of the above 
A) each is produced in an emission that is stimulated by another 
B) all come from the same atom 
C) the lasing material has only two quantum states 
D) all photons are alike, no matter what their source 
E) none of the above

Question 11

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

Accepted Answer

A) 30 ° 
B) 35.3° 
C) 48.2° 
D) 54.7° 
E) 60° 
A) 30 ° 
B) 35.3° 
C) 48.2° 
D) 54.7° 
E) 60°

Question 12

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 13

The quantity sz is related to the quantum number ms by:

Accepted Answer

A) sz = ms 
B) sz = ms   
  
C) sz = ms   
  
D) sz =   
E) sz =   
A) sz = ms 
B) sz = ms   
  
C) sz = ms   
  
D) sz =   
E) sz =

Question 14

In a laser:

Accepted Answer

A) excited atoms are stimulated to emit photons by radiation external to the laser 
B) the transitions for laser emission are directly to the ground state 
C) the states which give rise to laser emission are usually very unstable states that decay rapidly 
D) the state in which an atom is initially excited is never between two states that are involved in the stimulated emission 
E) a minimum of two energy levels are required. 
A) excited atoms are stimulated to emit photons by radiation external to the laser 
B) the transitions for laser emission are directly to the ground state 
C) the states which give rise to laser emission are usually very unstable states that decay rapidly 
D) the state in which an atom is initially excited is never between two states that are involved in the stimulated emission 
E) a minimum of two energy levels are required.

Question 15

The number of states in a shell with principal quantum number n = 3 is:

Accepted Answer

A) 3 
B) 8 
C) 9 
D) 18 
E) 32 
A) 3 
B) 8 
C) 9 
D) 18 
E) 32

Question 16

Which of the following (n, ℓ, mℓ, ms)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 17

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 18

The "e" in laser stands for:

Accepted Answer

A) electric 
B) emf 
C) energy 
D) emission 
E) entropy 
A) electric 
B) emf 
C) energy 
D) emission 
E) entropy

Question 19

In connection with x-ray emission the symbol L 1$\beta$ 1   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

Exam 40: All About Atoms

Photons in a laser beam are produced by:

The Einstein-de Haas experiment showed that:

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:

A laser must be pumped to achieve:

The quantity Lz is related to the quantum number mℓ by:

For any atom other that hydrogen and helium all electrons in the same shell have:

The magnitude of the orbital magnetic dipole moment of an atom is ( μ\muμ B is the Bohr magneton, and is a positive integer):

Space quantization means that:

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:

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because:

An electron in an atom is in a state with =3 and m11ef01aa_20b1_8f08_bc85_9d99908f7194_TB6585_11 =2.The angle between and the z axis is:

The quantity sz is related to the quantum number ms by:

In a laser:

The number of states in a shell with principal quantum number n = 3 is:

Which of the following (n, ℓ, mℓ, ms)combinations is impossible for an electron in an atom?

The Stern-Gerlach experiment makes use of:

The "e" in laser stands for:

In connection with x-ray emission the symbol L 1 β\betaβ 1 refers to:

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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 quantity L_z is related to the quantum number m_ℓby:

An electron in an atom is in a state with =3 and m_{11ef01aa_20b1_8f08_bc85_9d99908f7194_TB6585_11} =2.The angle between and the z axis is:

The quantity s_z is related to the quantum number m_sby:

Which of the following (n, ℓ, m_ℓ, m_s)combinations is impossible for an electron in an atom?

In connection with x-ray emission the symbol L 1_$\beta$ 1 refers to: