Question 1

An electron me = 9.11 × 10-31 kg) traveling with a velocity of 5.50 × 106 m/s has a de Broglie wavelength of approximately

Accepted Answer

A)  0.0710 nm. 
B)  0.130 nm. 
C)  0.180 nm. 
D)  0.230 nm. 
E)  0.550 nm. 
A)  0.0710 nm. 
B)  0.130 nm. 
C)  0.180 nm. 
D)  0.230 nm. 
E)  0.550 nm.

Question 2

In the photoelectric effect, the work function depends on the

Accepted Answer

A)  incident wavelength. 
B)  applied voltage. 
C)  light intensity. 
D)  metal that the light strikes. 
E)  current. 
A)  incident wavelength. 
B)  applied voltage. 
C)  light intensity. 
D)  metal that the light strikes. 
E)  current.

Question 3

The set of quantum numbers for the probability density shown is

Accepted Answer

A)  n = 2,   = 0, m = 0. 
B)  n = 2,   = 0, m = 1. 
C)  n = 2,   = 1, m = 0. 
D)  n = 1,   = 0, m = 0. 
E)  n = 1,   = 1, m = 0. 
A)  n = 2,   = 0, m = 0. 
B)  n = 2,   = 0, m = 1. 
C)  n = 2,   = 1, m = 0. 
D)  n = 1,   = 0, m = 0. 
E)  n = 1,   = 1, m = 0.

Question 4

What is the momentum in SI units) of a photon of wavelength λ = 480 nm? Planck's constant h = 6.626 × 10-34 J·s.)

Accepted Answer

A)  7.24 × 10-27 kg m/s 
B)  6.21 × 10-27 kg m/s 
C)  4.14 × 10-27 kg m/s 
D)  2.76 × 10-27 kg m/s 
E)  1.38 × 10-27 kg m/s 
A)  7.24 × 10-27 kg m/s 
B)  6.21 × 10-27 kg m/s 
C)  4.14 × 10-27 kg m/s 
D)  2.76 × 10-27 kg m/s 
E)  1.38 × 10-27 kg m/s

Question 5

In the Compton effect,

Accepted Answer

A)  an electron is stopped suddenly. 
B)  an x ray collides with an electron, the electron is ejected, and the x-ray photon ceases to exist. 
C)  a neutrino is produced in a nuclear decay. 
D)  an energetic photon collides with an electron, and both the electron and the photon are scattered. 
E)  None of these is correct. 
A)  an electron is stopped suddenly. 
B)  an x ray collides with an electron, the electron is ejected, and the x-ray photon ceases to exist. 
C)  a neutrino is produced in a nuclear decay. 
D)  an energetic photon collides with an electron, and both the electron and the photon are scattered. 
E)  None of these is correct.

Question 6

Light of wavelength 411 nm is observed from a hydrogen discharge tube. What transition produces this emission? The energy of the n = 1 level is -13.6 eV.

Accepted Answer

A)  n = 1.13 to n =1 
B)  n = 6 to n = 2 
C)  n = 3 to n = 3 
D)  n = 2 to n = 6 
E)  n = 5 to n = 1 
A)  n = 1.13 to n =1 
B)  n = 6 to n = 2 
C)  n = 3 to n = 3 
D)  n = 2 to n = 6 
E)  n = 5 to n = 1

Question 7

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 60º?

Accepted Answer

A)  13.3 × 10-14 J 
B)  3.27 × 10-14 J 
C)  28.0 × 10-14 J 
D)  7.36 × 10-14 J 
E)  2.14 × 10-14 J 
A)  13.3 × 10-14 J 
B)  3.27 × 10-14 J 
C)  28.0 × 10-14 J 
D)  7.36 × 10-14 J 
E)  2.14 × 10-14 J

Question 8

The work function for tungsten is 4.58 eV. What is the kinetic energy of electrons emitted when light of wavelength 400 nm is incident on a tungsten surface? Planck's constant h = 6.626 × 10-34 J · s = 4.136 × 10-15 eV · s.)

Accepted Answer

A)  0.74 eV 
B)  1.5 eV 
C)  7.7 eV 
D)  2.9 eV 
E)  No electrons are emitted. 
A)  0.74 eV 
B)  1.5 eV 
C)  7.7 eV 
D)  2.9 eV 
E)  No electrons are emitted.

Question 9

The wavelength of the visible line in the hydrogen spectrum that corresponds to m = 5 in the Balmer equation is

Accepted Answer

A)  656 nm. 
B)  486 nm. 
C)  434 nm. 
D)  410 nm. 
E)  None of these is correct. 
A)  656 nm. 
B)  486 nm. 
C)  434 nm. 
D)  410 nm. 
E)  None of these is correct.

Question 10

An x-ray photon of wavelength 0.10 nm is Compton-scattered from a free electron. The greatest observed shift in wavelength, as seen in the scattered photon, is

Accepted Answer

A)  0.0012 nm. 
B)  0.0024 nm. 
C)  0.0048 nm. 
D)  0.18 nm. 
E)  0.10 nm. 
A)  0.0012 nm. 
B)  0.0024 nm. 
C)  0.0048 nm. 
D)  0.18 nm. 
E)  0.10 nm.

Question 11

The kinetic energy of an electron moving in a circular orbit of radius r about a positive charge Ze varies

Accepted Answer

A)  directly with r. 
B)  directly with r2. 
C)  inversely with r. 
D)  inversely with r2. 
E)  inversely with r1/2. 
A)  directly with r. 
B)  directly with r2. 
C)  inversely with r. 
D)  inversely with r2. 
E)  inversely with r1/2.

Question 12

A gamma-ray photon of energy 100 keV scatters off an electron at an angle perpendicular to its original direction. Calculate the de Broglie wavelength of the recoiling electron.

Accepted Answer

A)  13.5 × 10-12 m 
B)  12.4 × 10-12 m 
C)  14.8 × 10-12 m 
D)  2.4 × 10-12 m 
E)  9.54 × 10-12 m 
A)  13.5 × 10-12 m 
B)  12.4 × 10-12 m 
C)  14.8 × 10-12 m 
D)  2.4 × 10-12 m 
E)  9.54 × 10-12 m

Question 13

The wavelength of an electron is 1.33 nm. Its kinetic energy is approximately

Accepted Answer

A)  1.18 eV. 
B)  1.08 eV. 
C)  0.922 eV. 
D)  0.850 eV. 
E)  3.40 eV. 
A)  1.18 eV. 
B)  1.08 eV. 
C)  0.922 eV. 
D)  0.850 eV. 
E)  3.40 eV.

Question 14

An electron in a hydrogen atom jumps from the n = 5 to n = 3 level. Is a photon absorbed or emitted in this process? What is the wavelength of the photon? State whether the photon is in the visible, ultraviolet, or infrared range of the electromagnetic spectrum.

Accepted Answer

A)  absorbed, 1280 nm, infrared 
B)  emitted, 605 nm, visible 
C)  emitted, 1280 nm, infrared 
D)  absorbed, 605 nm, visible 
E)  emitted, 605 nm, infrared 
A)  absorbed, 1280 nm, infrared 
B)  emitted, 605 nm, visible 
C)  emitted, 1280 nm, infrared 
D)  absorbed, 605 nm, visible 
E)  emitted, 605 nm, infrared

Question 15

An electron me = 9.11 × 10-31 kg) traveling with a velocity of 1.1 × 106 m/s has a de Broglie wavelength of approximately

Accepted Answer

A)  0.66 nm. 
B)  0.78 nm. 
C)  0.89 nm. 
D)  0.97 nm. 
E)  1.2 nm. 
A)  0.66 nm. 
B)  0.78 nm. 
C)  0.89 nm. 
D)  0.97 nm. 
E)  1.2 nm.

Question 16

The energy of the nth level in a one-electron atom is   . Consider a beryllium ion with all but one of its electrons removed a beryllium atom normally has four electrons). What is the energy of the electron when it is in the third-lowest energy state?

Accepted Answer

A)  -24 eV 
B)  -7.6 eV 
C)  -1.5 eV 
D)  24 eV 
E)  7.6 eV 
A)  -24 eV 
B)  -7.6 eV 
C)  -1.5 eV 
D)  24 eV 
E)  7.6 eV

Question 17

A 10.0-kg mass moving with a velocity of 100 m/s has a de Broglie wavelength of approximately

Accepted Answer

A)  1.98 × 10-22 m. 
B)  1.51 × 1036 m. 
C)  6.62 × 10-33 m. 
D)  6.62 × 10-37 m. 
E)  6.62 × 10-31 m. 
A)  1.98 × 10-22 m. 
B)  1.51 × 1036 m. 
C)  6.62 × 10-33 m. 
D)  6.62 × 10-37 m. 
E)  6.62 × 10-31 m.

Question 18

The symbol that represents the orbital angular momentum is

Accepted Answer

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

Question 19

What is the momentum in SI units) of a photon of wavelength λ = 410 nm? Planck's constant h = 6.626 × 10-34 J·s.)

Accepted Answer

A)  1.62 ×10-27 kg m/s 
B)  2.45 × 10-27 kg m/s 
C)  3.23 × 10-27 kg m/s 
D)  4.67 × 10-27 kg m/s 
E)  5.29 × 10-27 kg m/s 
A)  1.62 ×10-27 kg m/s 
B)  2.45 × 10-27 kg m/s 
C)  3.23 × 10-27 kg m/s 
D)  4.67 × 10-27 kg m/s 
E)  5.29 × 10-27 kg m/s

Question 20

J. J. Thomson's model of an atom

Accepted Answer

A)  had electrons embedded in some kind of fluid that contained most of the mass of the atom. 
B)  held that the fluid containing most of the mass of the atom had enough positive charge to make the atom electrically neutral. 
C)  failed to predict the observed frequencies for any atom. 
D)  depended upon electric forces to produce stability. 
E)  All of these are correct. 
A)  had electrons embedded in some kind of fluid that contained most of the mass of the atom. 
B)  held that the fluid containing most of the mass of the atom had enough positive charge to make the atom electrically neutral. 
C)  failed to predict the observed frequencies for any atom. 
D)  depended upon electric forces to produce stability. 
E)  All of these are correct.

Exam 26: Quantum Physics and Atomic Structure

An electron me = 9.11 × 10-31 kg) traveling with a velocity of 5.50 × 106 m/s has a de Broglie wavelength of approximately

In the photoelectric effect, the work function depends on the

The set of quantum numbers for the probability density shown is

What is the momentum in SI units) of a photon of wavelength λ = 480 nm? Planck's constant h = 6.626 × 10-34 J·s.)

In the Compton effect,

Light of wavelength 411 nm is observed from a hydrogen discharge tube. What transition produces this emission? The energy of the n = 1 level is -13.6 eV.

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 60º?

The work function for tungsten is 4.58 eV. What is the kinetic energy of electrons emitted when light of wavelength 400 nm is incident on a tungsten surface? Planck's constant h = 6.626 × 10-34 J · s = 4.136 × 10-15 eV · s.)

The wavelength of the visible line in the hydrogen spectrum that corresponds to m = 5 in the Balmer equation is

An x-ray photon of wavelength 0.10 nm is Compton-scattered from a free electron. The greatest observed shift in wavelength, as seen in the scattered photon, is

The kinetic energy of an electron moving in a circular orbit of radius r about a positive charge Ze varies

A gamma-ray photon of energy 100 keV scatters off an electron at an angle perpendicular to its original direction. Calculate the de Broglie wavelength of the recoiling electron.

The wavelength of an electron is 1.33 nm. Its kinetic energy is approximately

An electron in a hydrogen atom jumps from the n = 5 to n = 3 level. Is a photon absorbed or emitted in this process? What is the wavelength of the photon? State whether the photon is in the visible, ultraviolet, or infrared range of the electromagnetic spectrum.

An electron me = 9.11 × 10-31 kg) traveling with a velocity of 1.1 × 106 m/s has a de Broglie wavelength of approximately

The energy of the nth level in a one-electron atom is . Consider a beryllium ion with all but one of its electrons removed a beryllium atom normally has four electrons). What is the energy of the electron when it is in the third-lowest energy state?

A 10.0-kg mass moving with a velocity of 100 m/s has a de Broglie wavelength of approximately

The symbol that represents the orbital angular momentum is

What is the momentum in SI units) of a photon of wavelength λ = 410 nm? Planck's constant h = 6.626 × 10-34 J·s.)

J. J. Thomson's model of an atom

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

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An electron m_e = 9.11 × 10^-31 kg) traveling with a velocity of 5.50 × 10⁶ m/s has a de Broglie wavelength of approximately

What is the momentum in SI units) of a photon of wavelength λ = 480 nm? Planck's constant h = 6.626 × 10^-34 J·s.)

The work function for tungsten is 4.58 eV. What is the kinetic energy of electrons emitted when light of wavelength 400 nm is incident on a tungsten surface? Planck's constant h = 6.626 × 10^-34 J · s = 4.136 × 10^-15 eV · s.)

An electron m_e = 9.11 × 10^-31 kg) traveling with a velocity of 1.1 × 10⁶ m/s has a de Broglie wavelength of approximately

What is the momentum in SI units) of a photon of wavelength λ = 410 nm? Planck's constant h = 6.626 × 10^-34 J·s.)