Question 1

What is the wavelength of incident light needed for an electron to make the transition labeled f)?

Accepted Answer

A)  151 nm 
B)  365 nm 
C)  422 nm 
D)  821 nm 
E)  1459 nm 
A)  151 nm 
B)  365 nm 
C)  422 nm 
D)  821 nm 
E)  1459 nm

Question 2

Z for the element whose electronic configuration is 1s22s22p63s23p2 must be

Accepted Answer

A)  11. 
B)  14. 
C)  17. 
D)  21. 
E)  25. 
A)  11. 
B)  14. 
C)  17. 
D)  21. 
E)  25.

Question 3

What is the shift in wavelength of a photon scattered off an electron at 160º?

Accepted Answer

A)  2.4 pm 
B)  0.15 pm 
C)  1.6 pm 
D)  1.2 pm 
E)  4.7 pm 
A)  2.4 pm 
B)  0.15 pm 
C)  1.6 pm 
D)  1.2 pm 
E)  4.7 pm

Question 4

The number of electrons in the M shell for the element whose electronic configuration is 1s22s22p63s23p2 must be

Accepted Answer

A)  2. 
B)  4. 
C)  6. 
D)  8. 
E)  10. 
A)  2. 
B)  4. 
C)  6. 
D)  8. 
E)  10.

Question 5

Which of the following statements is true?

Accepted Answer

A)  The size of the nucleus of an atom is $\backsim$105 times smaller than the size of the atom. 
B)  The size of an atom is determined by the electron cloud. 
C)  Most of an atom is empty space. 
D)  The mass of an atom is determined primarily by the mass of the nucleus. 
E)  All of these are correct. 
A)  The size of the nucleus of an atom is $\backsim$105 times smaller than the size of the atom. 
B)  The size of an atom is determined by the electron cloud. 
C)  Most of an atom is empty space. 
D)  The mass of an atom is determined primarily by the mass of the nucleus. 
E)  All of these are correct.

Question 6

Electrons do not exhibit wave properties as readily as light because electrons typically have much __________ momenta than light and hence much __________ wavelengths.

Accepted Answer

A)  greater; longer 
B)  greater; shorter 
C)  lesser; longer 
D)  lesser; shorter 
E)  greater; the same 
A)  greater; longer 
B)  greater; shorter 
C)  lesser; longer 
D)  lesser; shorter 
E)  greater; the same

Question 7

The momentum of a 20-MeV electron is approximately

Accepted Answer

A)  1.6 × 10-21 kg · m/s. 
B)  2.4 × 10-42 kg · m/s. 
C)  5.8 × 10-42 kg · m/s. 
D)  2.4 × 10-21 kg · m/s. 
E)  5.8 × 10-21 kg · m/s. 
A)  1.6 × 10-21 kg · m/s. 
B)  2.4 × 10-42 kg · m/s. 
C)  5.8 × 10-42 kg · m/s. 
D)  2.4 × 10-21 kg · m/s. 
E)  5.8 × 10-21 kg · m/s.

Question 8

An alpha particle mass = 4 amu) is moving twice as fast as a proton mass = 1 amu). Calculate the de Broglie wavelength of the proton divided by the de Broglie wavelength of the alpha particle.

Accepted Answer

A)  1/4 
B)  8 
C)  1/8 
D)  2 
E)  1/2 
A)  1/4 
B)  8 
C)  1/8 
D)  2 
E)  1/2

Question 9

The graph shows the stopping potential for photoelectrons as a function of the frequency of the incident light for two different metals Cs and W). Which of the following statements is true?

Accepted Answer

A)  Because the intercepts are different, Planck's constant is not constant. 
B)  For a given frequency of incident light, the photoelectrons from W are more energetic than those from Cs. 
C)  The maximum kinetic energy of the photoelectrons increases as the frequency of the incident light increases. 
D)  The stopping potentials for all metals are the same. 
E)  The threshold frequency for Cs is greater than that for W. 
A)  Because the intercepts are different, Planck's constant is not constant. 
B)  For a given frequency of incident light, the photoelectrons from W are more energetic than those from Cs. 
C)  The maximum kinetic energy of the photoelectrons increases as the frequency of the incident light increases. 
D)  The stopping potentials for all metals are the same. 
E)  The threshold frequency for Cs is greater than that for W.

Question 10

Albert Einstein was awarded the Nobel Prize for his

Accepted Answer

A)  theory of special relativity. 
B)  theory of general relativity. 
C)  explanation of Brownian motion. 
D)  explanation of the Michelson-Morley experiment. 
E)  explanation of the photoelectric effect. 
A)  theory of special relativity. 
B)  theory of general relativity. 
C)  explanation of Brownian motion. 
D)  explanation of the Michelson-Morley experiment. 
E)  explanation of the photoelectric effect.

Question 11

The p state of an electronic configuration corresponds to

Accepted Answer

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

Question 12

Which of the following statements about Maxwell's theory of electromagnetism is false?

Accepted Answer

A)  The theory shows that light travels as transverse waves. 
B)  The theory shows that the speed of light is c in vacuum. 
C)  The theory shows that light travels as photons. 
D)  The theory shows that light consists of electric and magnetic waves. 
E)  The theory shows that light does not depend on existence of a medium to travel. 
A)  The theory shows that light travels as transverse waves. 
B)  The theory shows that the speed of light is c in vacuum. 
C)  The theory shows that light travels as photons. 
D)  The theory shows that light consists of electric and magnetic waves. 
E)  The theory shows that light does not depend on existence of a medium to travel.

Question 13

The speed of the escaping photoelectrons

Accepted Answer

A)  increases with increasing wavelength of the incident light. 
B)  decreases with increasing wavelength of the incident light. 
C)  is independent of the wavelength of the incident light. 
D)  is directly proportional to the intensity of the incident light. 
E)  depends only on the intensity of the incident light. 
A)  increases with increasing wavelength of the incident light. 
B)  decreases with increasing wavelength of the incident light. 
C)  is independent of the wavelength of the incident light. 
D)  is directly proportional to the intensity of the incident light. 
E)  depends only on the intensity of the incident light.

Question 14

Calculate the wavelength of light of energy 1 keV divided by the de Broglie wavelength of a proton of kinetic energy 1 meV.

Accepted Answer

A)  1.4 
B)  1.0 × 10-6 
C)  1.0 × 106 
D)  1.9 
E)  0.73 
A)  1.4 
B)  1.0 × 10-6 
C)  1.0 × 106 
D)  1.9 
E)  0.73

Question 15

The electron configuration of nitrogen Z = 7) is

Accepted Answer

A)  1s22s22p2. 
B)  1s22s32p3.  
C)  1s22s32p2. 
D)  1s22s22p4. 
E)  1s22s22p3. 
A)  1s22s22p2. 
B)  1s22s32p3.  
C)  1s22s32p2. 
D)  1s22s22p4. 
E)  1s22s22p3.

Question 16

An electron in the hydrogen atom ground-state energy = -13.6 eV) makes a transition from the n = 2 to the n = 4 energy level. Calculate the magnitude of the energy of the photon involved in this process and state whether the photon was absorbed or emitted.

Accepted Answer

A)  365 nm, absorbed 
B)  46 nm, emitted 
C)  7.6 nm, absorbed 
D)  1090 nm, absorbed 
E)  486 nm, absorbed 
A)  365 nm, absorbed 
B)  46 nm, emitted 
C)  7.6 nm, absorbed 
D)  1090 nm, absorbed 
E)  486 nm, absorbed

Question 17

In the Bohr model of the atom

Accepted Answer

A)  gravitational forces play a significant role. 
B)  electrons do not radiate energy when they are in a stable orbit. 
C)  the electrons spiral into the nucleus. 
D)  the energy of an electron in a stable orbit is an integral multiple of h/2π). 
E)  None of these is correct. 
A)  gravitational forces play a significant role. 
B)  electrons do not radiate energy when they are in a stable orbit. 
C)  the electrons spiral into the nucleus. 
D)  the energy of an electron in a stable orbit is an integral multiple of h/2π). 
E)  None of these is correct.

Question 18

When a surface is illuminated with light of wavelength 500 nm, the maximum speed of the photoelectrons is 300 km/s. When the same surface is illuminated by light of half this wavelength, what is the maximum speed of the photoelectrons in this case?

Accepted Answer

A)  680 km/s 
B)  1280 km/s 
C)  885 km/s 
D)  980 km/s 
E)  14800 km/s 
A)  680 km/s 
B)  1280 km/s 
C)  885 km/s 
D)  980 km/s 
E)  14800 km/s

Question 19

What is the ratio of the radius of the n = 3 orbit to that of the n = 2 orbit?

Accepted Answer

A)  1.50 
B)  4.50 
C)  2.25 
D)  0.666 
E)  None of these is correct. 
A)  1.50 
B)  4.50 
C)  2.25 
D)  0.666 
E)  None of these is correct.

Question 20

The graph shows the maximum kinetic energy of electrons emitted by a photosensitive surface as a function of the frequency of the incident radiation. The slope of this curve represents

Accepted Answer

A)  the intensity of the incident radiation. 
B)  the maximum kinetic energy. 
C)  the threshold frequency. 
D)  Planck's constant. 
E)  the stopping potential. 
A)  the intensity of the incident radiation. 
B)  the maximum kinetic energy. 
C)  the threshold frequency. 
D)  Planck's constant. 
E)  the stopping potential.

Exam 26: Quantum Physics and Atomic Structure

What is the wavelength of incident light needed for an electron to make the transition labeled f)?

Z for the element whose electronic configuration is 1s22s22p63s23p2 must be

What is the shift in wavelength of a photon scattered off an electron at 160º?

The number of electrons in the M shell for the element whose electronic configuration is 1s22s22p63s23p2 must be

Which of the following statements is true?

Electrons do not exhibit wave properties as readily as light because electrons typically have much __________ momenta than light and hence much __________ wavelengths.

The momentum of a 20-MeV electron is approximately

An alpha particle mass = 4 amu) is moving twice as fast as a proton mass = 1 amu). Calculate the de Broglie wavelength of the proton divided by the de Broglie wavelength of the alpha particle.

The graph shows the stopping potential for photoelectrons as a function of the frequency of the incident light for two different metals Cs and W). Which of the following statements is true?

Albert Einstein was awarded the Nobel Prize for his

The p state of an electronic configuration corresponds to

Which of the following statements about Maxwell's theory of electromagnetism is false?

The speed of the escaping photoelectrons

Calculate the wavelength of light of energy 1 keV divided by the de Broglie wavelength of a proton of kinetic energy 1 meV.

The electron configuration of nitrogen Z = 7) is

An electron in the hydrogen atom ground-state energy = -13.6 eV) makes a transition from the n = 2 to the n = 4 energy level. Calculate the magnitude of the energy of the photon involved in this process and state whether the photon was absorbed or emitted.

In the Bohr model of the atom

When a surface is illuminated with light of wavelength 500 nm, the maximum speed of the photoelectrons is 300 km/s. When the same surface is illuminated by light of half this wavelength, what is the maximum speed of the photoelectrons in this case?

What is the ratio of the radius of the n = 3 orbit to that of the n = 2 orbit?

The graph shows the maximum kinetic energy of electrons emitted by a photosensitive surface as a function of the frequency of the incident radiation. The slope of this curve represents

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

Z for the element whose electronic configuration is 1s²2s²2p⁶3s²3p²must be

The number of electrons in the M shell for the element whose electronic configuration is 1s²2s²2p⁶3s²3p²must be

Electrons do not exhibit wave properties as readily as light because electrons typically have much momenta than light and hence much wavelengths.