Question 1

Microwaves range in wavelength from about 2.0 × 10-2 cm to about 5.0 cm. What is the maximum energy in eV that a microwave may have?

Accepted Answer

A)  0.025 meV 
B)  6.2 meV 
C)  2.5 eV 
D)  6.2 eV 
E)  0.62 meV 
A)  0.025 meV 
B)  6.2 meV 
C)  2.5 eV 
D)  6.2 eV 
E)  0.62 meV B

Question 2

The graph shows the maximum kinetic energy of electrons emitted from a metal as a function of the frequency of the incident light. The work function of the metal is

Accepted Answer

A)  6.0 eV. 
B)  4.0 eV. 
C)  2.5 eV. 
D)  0.4 eV. 
E)  4 × 10-19 eV. 
A)  6.0 eV. 
B)  4.0 eV. 
C)  2.5 eV. 
D)  0.4 eV. 
E)  4 × 10-19 eV. C

Question 3

A gamma-ray photon of energy 1.00 MeV scatters off an electron at an angle perpendicular to its original direction. Calculate the kinetic energy of the recoiling electron.

Accepted Answer

A)  489 keV 
B)  511 keV 
C)  663 keV 
D)  253 keV 
E)  337 keV 
A)  489 keV 
B)  511 keV 
C)  663 keV 
D)  253 keV 
E)  337 keV C

Question 4

Large neutron-scattering facilities have been established to study the structure of materials since one of their advantages is that their wavelengths can be as small as the distance between atoms. For thermal 25° C) neutrons of energy 40 meV, calculate their de Broglie wavelength.

Accepted Answer

A)  4.8 × 10-10 nm 
B)  0.20 nm 
C)  0.14 nm 
D)  4.8 × 10+10 nm 
E)  2.0 nm 
A)  4.8 × 10-10 nm 
B)  0.20 nm 
C)  0.14 nm 
D)  4.8 × 10+10 nm 
E)  2.0 nm

Question 5

Suppose that the world could be changed so that the de Broglie wavelength of a 40-kg runner who goes 100 m in 10.0 s was 5 m. Assuming that all other constants remain the same, the value of Planck's constant would have to be

Accepted Answer

A)  0.80 J · s. 
B)  1.3 J · s. 
C)  0.76 J · s. 
D)  2.0 kJ · s. 
E)  0.20 MJ · s. 
A)  0.80 J · s. 
B)  1.3 J · s. 
C)  0.76 J · s. 
D)  2.0 kJ · s. 
E)  0.20 MJ · s.

Question 6

In the Bohr model of the hydrogen atom, what is the ratio of the speed of the electron moving in the n = 2 orbit divided by the speed of the electron in the n = 3 orbit?

Accepted Answer

A)  0.66 
B)  1.5 
C)  2.25 
D)  0.44 
E)  Its speed is independent of n. 
A)  0.66 
B)  1.5 
C)  2.25 
D)  0.44 
E)  Its speed is independent of n.

Question 7

What is the energy difference between the transition with the longest wavelength in the Lyman series and the transition with the shortest wavelength in the Paschen series?

Accepted Answer

A)  10.2 eV 
B)  8.71 eV 
C)  4.92 eV 
D)  11.7 eV 
E)  12.1 eV 
A)  10.2 eV 
B)  8.71 eV 
C)  4.92 eV 
D)  11.7 eV 
E)  12.1 eV

Question 8

If the angular momentum is characterized by the quantum number   = 3, what are the possible values of Lz in units of   ?

Accepted Answer

A)  -3, 0, +3 
B)  -3, -2, -1, 0 
C)  -2, -1, 0, +1, +2 
D)  -3, -2, -1, 0, +1, +2, +3 
A)  -3, 0, +3 
B)  -3, -2, -1, 0 
C)  -2, -1, 0, +1, +2 
D)  -3, -2, -1, 0, +1, +2, +3

Question 9

Using Bohr's model, the speed of an electron in the first orbit is

Accepted Answer

A)  3.14 × 105 m/s. 
B)  1.09 × 106 m/s. 
C)  1.37 × 107 m/s. 
D)  2.19 × 106 m/s. 
E)  None of these is correct. 
A)  3.14 × 105 m/s. 
B)  1.09 × 106 m/s. 
C)  1.37 × 107 m/s. 
D)  2.19 × 106 m/s. 
E)  None of these is correct.

Question 10

The symbol that represents the orbital quantum number is

Accepted Answer

A)  n. 
B)  m. 
C)  L. 
D)  l. 
E)  z. 
A)  n. 
B)  m. 
C)  L. 
D)  l. 
E)  z.

Question 11

In Compton scattering of x rays by electrons, the maximum shift in the x-ray wavelength occurs when the scattering angle is

Accepted Answer

A)  180º. 
B)  135º. 
C)  90º. 
D)  45º. 
E)  0º. 
A)  180º. 
B)  135º. 
C)  90º. 
D)  45º. 
E)  0º.

Question 12

The wave-particle duality theory is the first adequate explanation of which one of the following observations about the hydrogen atom?

Accepted Answer

A)  More than one possible orbit exists for the electron. 
B)  An infinite number of possible orbits exist for the electron. 
C)  Only certain energies are possible for the orbiting electron. 
D)  More than one momentum is possible for the orbiting electron. 
E)  None of these is correct. 
A)  More than one possible orbit exists for the electron. 
B)  An infinite number of possible orbits exist for the electron. 
C)  Only certain energies are possible for the orbiting electron. 
D)  More than one momentum is possible for the orbiting electron. 
E)  None of these is correct.

Question 13

An electron that is not localized in space is described by the wave function Ψ = A sinkx - ωt). The kinetic energy of the electron is 10 keV. The value of   is approximately

Accepted Answer

A)  1.6 × 10-11 m-1. 
B)  3.2 × 1013 m-1. 
C) 1.6 × 1011 m-1. 
D)  3.2 × 1011 m-1. 
E)  5.1 × 1011 m-1. 
A)  1.6 × 10-11 m-1. 
B)  3.2 × 1013 m-1. 
C) 1.6 × 1011 m-1. 
D)  3.2 × 1011 m-1. 
E)  5.1 × 1011 m-1.

Question 14

The visible portion of the electromagnetic spectrum extends from

Accepted Answer

A)  200 nm to 500 nm. 
B)  300 nm to 600 nm. 
C)  400 nm to 700 nm. 
D)  500 nm to 800 nm. 
E)  600 nm to 900 nm. 
A)  200 nm to 500 nm. 
B)  300 nm to 600 nm. 
C)  400 nm to 700 nm. 
D)  500 nm to 800 nm. 
E)  600 nm to 900 nm.

Question 15

A classical particle

Accepted Answer

A)  exhibits interference. 
B)  exhibits diffraction. 
C)  has energy associated with it that is spread out continuously in space and time. 
D)  obeys the laws of conservation of energy and momentum in collisions. 
E)  is described by none of the above. 
A)  exhibits interference. 
B)  exhibits diffraction. 
C)  has energy associated with it that is spread out continuously in space and time. 
D)  obeys the laws of conservation of energy and momentum in collisions. 
E)  is described by none of the above.

Question 16

The electron in a hydrogen atom has an orbital radius of 0.0500 nm. To avoid being pulled into the nucleus by electrostatic attraction, the electron must have an orbital speed of

Accepted Answer

A)  7.12 km/s. 
B)  25.2 km/s. 
C)  1.02 × 106 m/s. 
D)  2.25 × 106 m/s. 
E)  5.0 × 108 m/s. 
A)  7.12 km/s. 
B)  25.2 km/s. 
C)  1.02 × 106 m/s. 
D)  2.25 × 106 m/s. 
E)  5.0 × 108 m/s.

Question 17

The limit n = ∞) of a particular spectral series is the line of

Accepted Answer

A)  highest intensity in the series. 
B)  highest frequency in the visible spectrum. 
C)  lowest frequency in the visible spectrum. 
D)  lowest frequency possible in the series. 
E)  highest frequency possible in the series. 
A)  highest intensity in the series. 
B)  highest frequency in the visible spectrum. 
C)  lowest frequency in the visible spectrum. 
D)  lowest frequency possible in the series. 
E)  highest frequency possible in the series.

Question 18

The dissociation energy is the energy required to separate the two atoms in a diatomic molecule in their ground state. If the dissociation energy of molecular oxygen is 7.2 eV, then calculate the maximum wavelength of light from the Sun that can break apart atmospheric O2.

Accepted Answer

A)  1.7 × 10-7 nm 
B)  1.7 × 10-8 m 
C)  1.7 × 10-9 m 
D)  1.7 × 10-7 m 
E)  1.7 × 102 m 
A)  1.7 × 10-7 nm 
B)  1.7 × 10-8 m 
C)  1.7 × 10-9 m 
D)  1.7 × 10-7 m 
E)  1.7 × 102 m

Question 19

Photons of wavelength 0.00150 nm undergo Compton collisions with free electrons. What is the energy of the scattered photons whose angle of scattering is 45º?

Accepted Answer

A)  13.3 × 10-14 J 
B)  9.00 × 10-14 J 
C)  28.0 × 10-14 J 
D)  18.0 × 10-14 J 
E)  2.14 × 10-14 J 
A)  13.3 × 10-14 J 
B)  9.00 × 10-14 J 
C)  28.0 × 10-14 J 
D)  18.0 × 10-14 J 
E)  2.14 × 10-14 J

Question 20

An electron that is not localized in space is described by the wave function Ψ = A sin kx - ωt). The kinetic energy of the electron is 10 keV. The value of ω is approximately

Accepted Answer

A)  1.5 × 1019 s-1. 
B)  3.0 × 1019 s-1. 
C)  4.5 × 1019 s-1. 
D)  1.5 × 1021 s-1. 
E)  3.0 × 1021 s-1. 
A)  1.5 × 1019 s-1. 
B)  3.0 × 1019 s-1. 
C)  4.5 × 1019 s-1. 
D)  1.5 × 1021 s-1. 
E)  3.0 × 1021 s-1.

Exam 26: Quantum Physics and Atomic Structure

Microwaves range in wavelength from about 2.0 × 10-2 cm to about 5.0 cm. What is the maximum energy in eV that a microwave may have?

The graph shows the maximum kinetic energy of electrons emitted from a metal as a function of the frequency of the incident light. The work function of the metal is

A gamma-ray photon of energy 1.00 MeV scatters off an electron at an angle perpendicular to its original direction. Calculate the kinetic energy of the recoiling electron.

Large neutron-scattering facilities have been established to study the structure of materials since one of their advantages is that their wavelengths can be as small as the distance between atoms. For thermal 25° C) neutrons of energy 40 meV, calculate their de Broglie wavelength.

Suppose that the world could be changed so that the de Broglie wavelength of a 40-kg runner who goes 100 m in 10.0 s was 5 m. Assuming that all other constants remain the same, the value of Planck's constant would have to be

In the Bohr model of the hydrogen atom, what is the ratio of the speed of the electron moving in the n = 2 orbit divided by the speed of the electron in the n = 3 orbit?

What is the energy difference between the transition with the longest wavelength in the Lyman series and the transition with the shortest wavelength in the Paschen series?

If the angular momentum is characterized by the quantum number = 3, what are the possible values of Lz in units of ?

Using Bohr's model, the speed of an electron in the first orbit is

The symbol that represents the orbital quantum number is

In Compton scattering of x rays by electrons, the maximum shift in the x-ray wavelength occurs when the scattering angle is

The wave-particle duality theory is the first adequate explanation of which one of the following observations about the hydrogen atom?

An electron that is not localized in space is described by the wave function Ψ = A sinkx - ωt). The kinetic energy of the electron is 10 keV. The value of is approximately

The visible portion of the electromagnetic spectrum extends from

A classical particle

The electron in a hydrogen atom has an orbital radius of 0.0500 nm. To avoid being pulled into the nucleus by electrostatic attraction, the electron must have an orbital speed of

The limit n = ∞) of a particular spectral series is the line of

The dissociation energy is the energy required to separate the two atoms in a diatomic molecule in their ground state. If the dissociation energy of molecular oxygen is 7.2 eV, then calculate the maximum wavelength of light from the Sun that can break apart atmospheric O2.

Photons of wavelength 0.00150 nm undergo Compton collisions with free electrons. What is the energy of the scattered photons whose angle of scattering is 45º?

An electron that is not localized in space is described by the wave function Ψ = A sin kx - ωt). The kinetic energy of the electron is 10 keV. The value of ω is approximately

Introduction to Physics

Linear Motion

Motion in Two and Three Dimensions

Forces and Motion I: Newtons Laws

Forces and Motion II: Applications

Work and Energy

Momentum, Collisions, and the Center of Mass

Rotational Motion

Elastic Properties of Matter: Stress and Strain

Gravitation

Fluids

Oscillations

Waves

Thermodynamics I

Thermodynamics II

Electrostatics I: Electric Charge, Forces, and Fields

Electrostatics II: Electric Potential Energy and Electric Potential

Electric Charges in Motion

Magnetism

Electromagnetic Induction

Alternating-Current Circuits

Electromagnetic Waves

Wave Properties of Light

Geometrical Optics

Relativity

Nuclear Physics

Particle Physics

Filters

Microwaves range in wavelength from about 2.0 × 10^-2 cm to about 5.0 cm. What is the maximum energy in eV that a microwave may have?

If the angular momentum is characterized by the quantum number = 3, what are the possible values of L_z in units of ?

The dissociation energy is the energy required to separate the two atoms in a diatomic molecule in their ground state. If the dissociation energy of molecular oxygen is 7.2 eV, then calculate the maximum wavelength of light from the Sun that can break apart atmospheric O₂.