Question 1

X-rays are

Accepted Answer

A)  electromagnetic waves of very short wavelength. 
B)  electromagnetic waves of very long wavelength. 
C)  matter waves of very short wavelength. 
D)  matter waves of very long wavelength. 
A)  electromagnetic waves of very short wavelength. 
B)  electromagnetic waves of very long wavelength. 
C)  matter waves of very short wavelength. 
D)  matter waves of very long wavelength.

Question 2

Planck's constant is h = 6.6 × 10-34 Js and the electron mass is 9.1 × 10-31 kg. The speed of an electron whose de Broglie wavelength is 10-10 is

Accepted Answer

A)  6.6 × 10-24 m/s. 
B)  3.8 × 103 m/s. 
C)  7.3 × 106 m/s. 
D)  1010 m/s. 
A)  6.6 × 10-24 m/s. 
B)  3.8 × 103 m/s. 
C)  7.3 × 106 m/s. 
D)  1010 m/s.

Question 3

The electron structures of atoms never emit

Accepted Answer

A)  gamma rays. 
B)  x-rays. 
C)  ultraviolet light. 
D)  infrared light. 
A)  gamma rays. 
B)  x-rays. 
C)  ultraviolet light. 
D)  infrared light.

Question 4

The light waves from a laser

Accepted Answer

A)  have different wavelengths. 
B)  have different speeds. 
C)  are in step with one another. 
D)  spread out to form a wide beam. 
A)  have different wavelengths. 
B)  have different speeds. 
C)  are in step with one another. 
D)  spread out to form a wide beam.

Question 5

The uncertainty principle is a fundamental part of

Accepted Answer

A)  Newtonian mechanics. 
B)  quantum mechanics. 
C)  the quantum theory of light. 
D)  the Bohr theory of the hydrogen atom. 
A)  Newtonian mechanics. 
B)  quantum mechanics. 
C)  the quantum theory of light. 
D)  the Bohr theory of the hydrogen atom.

Question 6

Classical physics cannot account for why

Accepted Answer

A)  atoms can contain electrons. 
B)  atomic electrons are in motion. 
C)  atoms can emit electromagnetic waves. 
D)  atoms can be stable. 
A)  atoms can contain electrons. 
B)  atomic electrons are in motion. 
C)  atoms can emit electromagnetic waves. 
D)  atoms can be stable.

Question 7

When a hydrogen atom is in its lowest energy level,

Accepted Answer

A)  the de Broglie wavelength of its electron equals its orbit diameter. 
B)  the de Broglie wavelength of its electron equals its orbit circumference. 
C)  its electron has left the atom. 
D)  its electron is at rest. 
A)  the de Broglie wavelength of its electron equals its orbit diameter. 
B)  the de Broglie wavelength of its electron equals its orbit circumference. 
C)  its electron has left the atom. 
D)  its electron is at rest.

Question 8

An electron and a gamma ray have the same wavelength.

Accepted Answer

A)  The electron has less energy than the photon energy of the gamma ray. 
B)  The electron has the same energy as the photon energy of the gamma ray. 
C)  The electron has more energy than the photon energy of the gamma ray. 
D)  Any of these choices could be correct, depending on the wavelength. 
A)  The electron has less energy than the photon energy of the gamma ray. 
B)  The electron has the same energy as the photon energy of the gamma ray. 
C)  The electron has more energy than the photon energy of the gamma ray. 
D)  Any of these choices could be correct, depending on the wavelength.

Question 9

The number of quantum numbers needed to describe the state of an atomic electron is

Accepted Answer

A)  1. 
B)  2. 
C)  3. 
D)  4. 
A)  1. 
B)  2. 
C)  3. 
D)  4.

Question 10

The idea that light has both wave and particle properties is accepted because

Accepted Answer

A)  theory and experiment agree. 
B)  it is in accord with common sense. 
C)  it was revealed to Einstein in a dream. 
D)  photons have actually been seen. 
A)  theory and experiment agree. 
B)  it is in accord with common sense. 
C)  it was revealed to Einstein in a dream. 
D)  photons have actually been seen.

Question 11

An electron in an s state of an atom has an angular momentum quantum number of

Accepted Answer

A)  0. 
B)  1. 
C)  2. 
D)  3. 
A)  0. 
B)  1. 
C)  2. 
D)  3.

Question 12

The speed of the wave packet that corresponds to a moving particle is

Accepted Answer

A)  less than the speed of light. 
B)  equal to the speed of light. 
C)  greater than the speed of light. 
D)  Any of these choices could be correct, depending on the frequency. 
A)  less than the speed of light. 
B)  equal to the speed of light. 
C)  greater than the speed of light. 
D)  Any of these choices could be correct, depending on the frequency.

Question 13

The wider the wavepacket of a particle, the

Accepted Answer

A)  longer its wavelength. 
B)  higher its speed. 
C)  more precisely its position can be determined. 
D)  more precisely its momentum can be determined. 
A)  longer its wavelength. 
B)  higher its speed. 
C)  more precisely its position can be determined. 
D)  more precisely its momentum can be determined.

Question 14

The wave character of a moving golf ball is not observed because

Accepted Answer

A)  the ball is uncharged. 
B)  the matter waves are moving too fast. 
C)  the frequency of the matter waves is too low. 
D)  the wavelength of the matter waves is too short. 
A)  the ball is uncharged. 
B)  the matter waves are moving too fast. 
C)  the frequency of the matter waves is too low. 
D)  the wavelength of the matter waves is too short.

Question 15

Matter waves are

Accepted Answer

A)  associated with all particles. 
B)  never associated with stationary particles. 
C)  never associated with charged particles. 
D)  never associated with uncharged particles. 
A)  associated with all particles. 
B)  never associated with stationary particles. 
C)  never associated with charged particles. 
D)  never associated with uncharged particles.

Question 16

Planck's constant is h = 6.6 × 10-34 Js. An x-ray photon has an energy of 6.6 × 10-15 J. The frequency that corresponds to this energy is

Accepted Answer

A)  4.4 × 10-48 Hz. 
B)  10-19 Hz. 
C)  1015 Hz. 
D)  1019 Hz. 
A)  4.4 × 10-48 Hz. 
B)  10-19 Hz. 
C)  1015 Hz. 
D)  1019 Hz.

Question 17

The fact that no two electrons in an atom can have the same set of quantum numbers is known as the

Accepted Answer

A)  Bohr principle. 
B)  de Broglie principle. 
C)  exclusion principle. 
D)  uncertainty principle. 
A)  Bohr principle. 
B)  de Broglie principle. 
C)  exclusion principle. 
D)  uncertainty principle.

Question 18

A photon is emitted by an atom when one of the atom's electrons

Accepted Answer

A)  leaves the atom. 
B)  collides with another of its electrons. 
C)  shifts to a lower energy level. 
D)  shifts to a higher energy level. 
A)  leaves the atom. 
B)  collides with another of its electrons. 
C)  shifts to a lower energy level. 
D)  shifts to a higher energy level.

Question 19

Each orbital in an atom can be occupied by

Accepted Answer

A)  only one electron. 
B)  two electrons with spins in the same direction. 
C)  two electrons with spins in opposite directions. 
D)  any number of electrons. 
A)  only one electron. 
B)  two electrons with spins in the same direction. 
C)  two electrons with spins in opposite directions. 
D)  any number of electrons.

Question 20

Planck's constant is h = 6.6 × 10-34 Js. Light of wavelength 5 × 10-7 m consists of photons whose energy is

Accepted Answer

A)  1.1 × 10-48 J. 
B)  1.3 × 10-27 J. 
C)  4 × 10-19 J. 
D)  1.7 × 10-15 J. 
A)  1.1 × 10-48 J. 
B)  1.3 × 10-27 J. 
C)  4 × 10-19 J. 
D)  1.7 × 10-15 J.

X-rays are

Planck's constant is h = 6.6 × 10^-34 Js and the electron mass is 9.1 × 10^-31 kg. The speed of an electron whose de Broglie wavelength is 10^-10 is

The electron structures of atoms never emit

The light waves from a laser

The uncertainty principle is a fundamental part of

Classical physics cannot account for why

When a hydrogen atom is in its lowest energy level,

An electron and a gamma ray have the same wavelength.

The number of quantum numbers needed to describe the state of an atomic electron is

The idea that light has both wave and particle properties is accepted because

An electron in an s state of an atom has an angular momentum quantum number of

The speed of the wave packet that corresponds to a moving particle is

The wider the wavepacket of a particle, the

The wave character of a moving golf ball is not observed because

Matter waves are

Planck's constant is h = 6.6 × 10^-34 Js. An x-ray photon has an energy of 6.6 × 10^-15 J. The frequency that corresponds to this energy is

The fact that no two electrons in an atom can have the same set of quantum numbers is known as the

A photon is emitted by an atom when one of the atom's electrons

Each orbital in an atom can be occupied by

Planck's constant is h = 6.6 × 10^-34 Js. Light of wavelength 5 × 10^-7 m consists of photons whose energy is

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe Galaxies

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Exam 9: The Atom

X-rays are

Planck's constant is h = 6.6 × 10-34 Js and the electron mass is 9.1 × 10-31 kg. The speed of an electron whose de Broglie wavelength is 10-10 is

The electron structures of atoms never emit

The light waves from a laser

The uncertainty principle is a fundamental part of

Classical physics cannot account for why

When a hydrogen atom is in its lowest energy level,

An electron and a gamma ray have the same wavelength.

The number of quantum numbers needed to describe the state of an atomic electron is

The idea that light has both wave and particle properties is accepted because

An electron in an s state of an atom has an angular momentum quantum number of

The speed of the wave packet that corresponds to a moving particle is

The wider the wavepacket of a particle, the

The wave character of a moving golf ball is not observed because

Matter waves are

Planck's constant is h = 6.6 × 10-34 Js. An x-ray photon has an energy of 6.6 × 10-15 J. The frequency that corresponds to this energy is

The fact that no two electrons in an atom can have the same set of quantum numbers is known as the

A photon is emitted by an atom when one of the atom's electrons

Each orbital in an atom can be occupied by

Planck's constant is h = 6.6 × 10-34 Js. Light of wavelength 5 × 10-7 m consists of photons whose energy is

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe Galaxies

Filters

Planck's constant is h = 6.6 × 10^-34 Js and the electron mass is 9.1 × 10^-31 kg. The speed of an electron whose de Broglie wavelength is 10^-10 is

Planck's constant is h = 6.6 × 10^-34 Js. An x-ray photon has an energy of 6.6 × 10^-15 J. The frequency that corresponds to this energy is

Planck's constant is h = 6.6 × 10^-34 Js. Light of wavelength 5 × 10^-7 m consists of photons whose energy is