Question 1

How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s)

Accepted Answer

A)  6.09 × 1015 photons/s 
B)  5.03 × 1012 photons/s 
C)  3.07 × 1015 photons/s 
D)  3.07 × 1013 photons/s 
A)  6.09 × 1015 photons/s 
B)  5.03 × 1012 photons/s 
C)  3.07 × 1015 photons/s 
D)  3.07 × 1013 photons/s A

Question 2

An electron in a hydrogen atom has principal quantum number n = 4. How many possible values of the orbital quantum number l could it have?

Accepted Answer

A)  8 
B)  9 
C)  3 
D)  4 
E)  10 
A)  8 
B)  9 
C)  3 
D)  4 
E)  10 D

Question 3

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mh ≈ mproton =
1.67 × 10-27 kg)

Accepted Answer

A)  44.2 km/s 
B)  21.7 km/s 
C)  66.5 km/s 
D)  113 km/s 
E)  51.0 km/s 
A)  44.2 km/s 
B)  21.7 km/s 
C)  66.5 km/s 
D)  113 km/s 
E)  51.0 km/s A

Question 4

An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. A magnetic field is applied, defining the z-axis along the field. Which of the following sets of angles are possible angles between the magnetic field and the orbital angular momentum?

Accepted Answer

A)  45° 
B)  90° 
C)  45°, 90° 
D)  45°, 135° 
E)  45°, 90°, 135° 
A)  45° 
B)  90° 
C)  45°, 90° 
D)  45°, 135° 
E)  45°, 90°, 135°

Question 5

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?

Accepted Answer

A)  107° 
B)  90.0° 
C)  73.2° 
D)  54.7° 
E)  0.00° 
A)  107° 
B)  90.0° 
C)  73.2° 
D)  54.7° 
E)  0.00°

Question 6

How many electrons does it take to fill the d subshell?

Accepted Answer

A)  10 
B)  6 
C)  14 
D)  4 
E)  8 
A)  10 
B)  6 
C)  14 
D)  4 
E)  8

Question 7

Consider the n = 9 shell.
(a) What is the largest value of the orbital quantum number, l, in this shell?
(b) How many electrons can be placed in this shell?

Accepted Answer

The answer of Consider the n = 9 shell.
(a) What...

Question 8

What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10-19 J, mh ≈ mproton = 1.67 × 10-27 kg)

Accepted Answer

A)  44.2 km/s 
B)  21.7 km/s 
C)  66.5 km/s 
D)  113 km/s 
E)  51.0 km/s 
A)  44.2 km/s 
B)  21.7 km/s 
C)  66.5 km/s 
D)  113 km/s 
E)  51.0 km/s

Question 9

The only VALID electron state and shell designation among the following is

Accepted Answer

A)  1p, K. 
B)  2s, K. 
C)  1s, L. 
D)  2p, L. 
E)  3f, M. 
A)  1p, K. 
B)  2s, K. 
C)  1s, L. 
D)  2p, L. 
E)  3f, M.

Question 10

The only INVALID electron state and shell designation among the following is

Accepted Answer

A)  1s, K. 
B)  2s, L. 
C)  2d, L. 
D)  3s, M. 
E)  3d, M. 
A)  1s, K. 
B)  2s, L. 
C)  2d, L. 
D)  3s, M. 
E)  3d, M.

Question 11

What is the correct electronic configuration for the ground state sodium atom, which has 11 electrons?

Accepted Answer

A)  1s12s23p62s2 
B)  1s22s13p62s2 
C)  1s12s22p6 
D)  1s22s22p63s2 
E)  1s22s22p63s1 
A)  1s12s23p62s2 
B)  1s22s13p62s2 
C)  1s12s22p6 
D)  1s22s22p63s2 
E)  1s22s22p63s1

Question 12

How many possible sets of quantum numbers (electron states) are there in the 5f subshell?

Accepted Answer

A)  2 
B)  6 
C)  8 
D)  10 
E)  14 
A)  2 
B)  6 
C)  8 
D)  10 
E)  14

Question 13

What is the correct electronic configuration for ground state carbon, which has 6 electrons?

Accepted Answer

A)  1s22s22p2 
B)  1s12p1 
C)  1s12s22p1 
D)  1s12s12p1 
E)  1s22s22p4 
A)  1s22s22p2 
B)  1s12p1 
C)  1s12s22p1 
D)  1s12s12p1 
E)  1s22s22p4

Question 14

What is the electron configuration for ground state Li, which has 3 electrons?

Accepted Answer

A)  1s3 
B)  1s12s2 
C)  1s22s1 
D)  1s21p1 
E)  1s11p2 
A)  1s3 
B)  1s12s2 
C)  1s22s1 
D)  1s21p1 
E)  1s11p2

Question 15

Which of the following are characteristics of laser light? (There may be more than one correct choice.)

Accepted Answer

A)  It is coherent. 
B)  It is produced by an inverted population of atoms. 
C)  It contains a full spectrum of wavelengths. 
A)  It is coherent. 
B)  It is produced by an inverted population of atoms. 
C)  It contains a full spectrum of wavelengths.

Question 16

The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.6022 × 10-19 J)

Accepted Answer

A)  1.537 eV 
B)  1.646 eV 
C)  1.786 eV 
D)  1.812 eV 
E)  3.572 eV 
A)  1.537 eV 
B)  1.646 eV 
C)  1.786 eV 
D)  1.812 eV 
E)  3.572 eV

Question 17

The correct ground state electron configuration of boron, which has 5 electrons, is

Accepted Answer

A)  1s22s22p. 
B)  1s22s22p3. 
C)  1s21p22s. 
D)  1s22p23s. 
E)  1s22p3. 
A)  1s22s22p. 
B)  1s22s22p3. 
C)  1s21p22s. 
D)  1s22p23s. 
E)  1s22p3.

Question 18

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which one of the following numbers could be the principal quantum number n of the electron?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4 
A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 19

In a ruby laser, an electron jumps from a higher energy level to a lower one. If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  350 nm 
B)  470 nm 
C)  650 nm 
D)  690 nm 
E)  960 nm 
A)  350 nm 
B)  470 nm 
C)  650 nm 
D)  690 nm 
E)  960 nm

Question 20

The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 5 state?

Accepted Answer

A)  2.72 eV 
B)  -2.72 eV 
C)  0.544 eV 
D)  -0.544 eV 
E)  -68 eV 
A)  2.72 eV 
B)  -2.72 eV 
C)  0.544 eV 
D)  -0.544 eV 
E)  -68 eV

Exam 41: Atomic Physics

How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s)

An electron in a hydrogen atom has principal quantum number n = 4. How many possible values of the orbital quantum number l could it have?

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mh ≈ mproton = 1.67 × 10-27 kg)

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?

How many electrons does it take to fill the d subshell?

Consider the n = 9 shell. (a) What is the largest value of the orbital quantum number, l, in this shell? (b) How many electrons can be placed in this shell?

What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10-19 J, mh ≈ mproton = 1.67 × 10-27 kg)

The only VALID electron state and shell designation among the following is

The only INVALID electron state and shell designation among the following is

What is the correct electronic configuration for the ground state sodium atom, which has 11 electrons?

How many possible sets of quantum numbers (electron states) are there in the 5f subshell?

What is the correct electronic configuration for ground state carbon, which has 6 electrons?

What is the electron configuration for ground state Li, which has 3 electrons?

Which of the following are characteristics of laser light? (There may be more than one correct choice.)

The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.6022 × 10-19 J)

The correct ground state electron configuration of boron, which has 5 electrons, is

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which one of the following numbers could be the principal quantum number n of the electron?

In a ruby laser, an electron jumps from a higher energy level to a lower one. If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 5 state?

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How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm? (c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10^-19 J, m_h ≈ m_proton = 1.67 × 10^-27 kg)

What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10^-19 J, m_h ≈ m_proton = 1.67 × 10^-27 kg)

The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.6022 × 10^-19 J)

In a ruby laser, an electron jumps from a higher energy level to a lower one. If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon? (c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19 J)