Question 1

The speed of a photon

Accepted Answer

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

Question 2

The photoelectric effect occurs only when the incident light has more than a certain minimum

Accepted Answer

A)  frequency. 
B)  wavelength. 
C)  speed. 
D)  charge. 
A)  frequency. 
B)  wavelength. 
C)  speed. 
D)  charge. A

Question 3

The wavelengths in the various spectral series of an element

Accepted Answer

A)  are the same for all elements. 
B)  are random. 
C)  are different for each element. 
D)  are different in the emission and absorption spectra of an element. 
A)  are the same for all elements. 
B)  are random. 
C)  are different for each element. 
D)  are different in the emission and absorption spectra of an element. C

Question 4

The orbital of an electron in an atom is

Accepted Answer

A)  the region around the nucleus in which it is most likely to be found. 
B)  the path it follows around the nucleus. 
C)  its de Broglie wave. 
D)  its angular momentum. 
A)  the region around the nucleus in which it is most likely to be found. 
B)  the path it follows around the nucleus. 
C)  its de Broglie wave. 
D)  its angular momentum.

Question 5

A p orbital

Accepted Answer

A)  is spherical in shape. 
B)  is shaped like a doughnut. 
C)  has two lobes. 
D)  has six lobes. 
A)  is spherical in shape. 
B)  is shaped like a doughnut. 
C)  has two lobes. 
D)  has six lobes.

Question 6

The quantum number n of the lowest energy state of a hydrogen atom

Accepted Answer

A)  is 0. 
B)  is 1. 
C)  depends on the orbit size. 
D)  depends on the electron speed. 
A)  is 0. 
B)  is 1. 
C)  depends on the orbit size. 
D)  depends on the electron speed.

Question 7

A neon sign does not produce

Accepted Answer

A)  a line spectrum. 
B)  an emission spectrum. 
C)  an absorption spectrum. 
D)  photons. 
A)  a line spectrum. 
B)  an emission spectrum. 
C)  an absorption spectrum. 
D)  photons.

Question 8

Which of the following cannot be explained by the quantum theory of light?

Accepted Answer

A)  interference 
B)  blackbody radiation 
C)  the photoelectric effect 
D)  X-ray production 
A)  interference 
B)  blackbody radiation 
C)  the photoelectric effect 
D)  X-ray production

Question 9

A proton and an electron have the same de Broglie wavelength.

Accepted Answer

A)  The electron has the higher speed. 
B)  The proton has the higher speed. 
C)  They have the same speed. 
D)  Any of the choices is true, depending on the wavelength. 
A)  The electron has the higher speed. 
B)  The proton has the higher speed. 
C)  They have the same speed. 
D)  Any of the choices is true, depending on the wavelength.

Question 10

The number of values the spin magnetic quantum number ms of an atomic electron can have is

Accepted Answer

A)  1. 
B)  2. 
C)  always equal to n, the principal quantum number. 
D)  always equal to 2n. 
A)  1. 
B)  2. 
C)  always equal to n, the principal quantum number. 
D)  always equal to 2n.

Question 11

The sun's spectrum consists of a bright background crossed by dark lines. This suggests that the sun

Accepted Answer

A)  is a hot object surrounded by a hot atmosphere. 
B)  is a hot object surrounded by a cool temperature. 
C)  is a cool object surrounded by a hot temperature. 
D)  is a cool object surrounded by a cool atmosphere. 
A)  is a hot object surrounded by a hot atmosphere. 
B)  is a hot object surrounded by a cool temperature. 
C)  is a cool object surrounded by a hot temperature. 
D)  is a cool object surrounded by a cool atmosphere.

Question 12

A beam of light whose waves are all in step with one another is said to be

Accepted Answer

A)  coherent. 
B)  incoherent. 
C)  quantized. 
D)  diffracted. 
A)  coherent. 
B)  incoherent. 
C)  quantized. 
D)  diffracted.

Question 13

Planck's constant is h = 6.6 × 10-34 Js and the electron mass is 9.1 × 10-31 kg. The de Broglie wavelength of an electron whose speed is 108 m/s is

Accepted Answer

A)  5.9 × 10-56 m. 
B)  1.5 × 10-19 m. 
C)  7.3 × 10-12 m. 
D)  1.4 × 1011 m. 
A)  5.9 × 10-56 m. 
B)  1.5 × 10-19 m. 
C)  7.3 × 10-12 m. 
D)  1.4 × 1011 m.

Question 14

If Planck's constant were smaller than it is,

Accepted Answer

A)  moving bodies would have longer wavelengths. 
B)  moving bodies would have lower speeds. 
C)  the uncertainty principle would be less significant. 
D)  photons would have higher energies. 
A)  moving bodies would have longer wavelengths. 
B)  moving bodies would have lower speeds. 
C)  the uncertainty principle would be less significant. 
D)  photons would have higher energies.

Question 15

The energy difference between adjacent energy levels in a hydrogen atom

Accepted Answer

A)  decreases with increasing quantum numbers. 
B)  increases with increasing quantum numbers. 
C)  is the same for all quantum numbers. 
D)  shows no regularities. 
A)  decreases with increasing quantum numbers. 
B)  increases with increasing quantum numbers. 
C)  is the same for all quantum numbers. 
D)  shows no regularities.

Question 16

An increase in the voltage applied to an X-ray tube causes an increase in the X-rays'

Accepted Answer

A)  wavelength. 
B)  speed. 
C)  energy. 
D)  number. 
A)  wavelength. 
B)  speed. 
C)  energy. 
D)  number.

Question 17

In an emission spectral series, the

Accepted Answer

A)  lines are evenly spaced. 
B)  excited electrons all started from the same energy level. 
C)  excited electrons all return to the same energy level. 
D)  excited electrons leave the atoms. 
A)  lines are evenly spaced. 
B)  excited electrons all started from the same energy level. 
C)  excited electrons all return to the same energy level. 
D)  excited electrons leave the atoms.

Question 18

In order to increase the rate at which photoelectrons are emitted by a surface on which light is directed, it is necessary to increase the

Accepted Answer

A)  frequency of the light. 
B)  wavelength of the light. 
C)  intensity of the light. 
D)  speed of the light. 
A)  frequency of the light. 
B)  wavelength of the light. 
C)  intensity of the light. 
D)  speed of the light.

Question 19

According to the uncertainty principle, it is impossible to precisely determine

Accepted Answer

A)  only the position of a particle. 
B)  only the momentum of a particle. 
C)  either the position or the momentum of a particle. 
D)  both the position and the momentum of a particle. 
A)  only the position of a particle. 
B)  only the momentum of a particle. 
C)  either the position or the momentum of a particle. 
D)  both the position and the momentum of a particle.

Question 20

Electrons

Accepted Answer

A)  have no magnetic properties. 
B)  have the same magnetic behavior as particles of iron. 
C)  behave like tiny bar magnets of different strengths. 
D)  behave like tiny bar magnets of the same strength. 
A)  have no magnetic properties. 
B)  have the same magnetic behavior as particles of iron. 
C)  behave like tiny bar magnets of different strengths. 
D)  behave like tiny bar magnets of the same strength.

The speed of a photon

The photoelectric effect occurs only when the incident light has more than a certain minimum

The wavelengths in the various spectral series of an element

The orbital of an electron in an atom is

A p orbital

The quantum number n of the lowest energy state of a hydrogen atom

A neon sign does not produce

Which of the following cannot be explained by the quantum theory of light?

A proton and an electron have the same de Broglie wavelength.

The number of values the spin magnetic quantum number m_s of an atomic electron can have is

The sun's spectrum consists of a bright background crossed by dark lines. This suggests that the sun

A beam of light whose waves are all in step with one another is said to be

Planck's constant is h = 6.6 × 10^-34 Js and the electron mass is 9.1 × 10^-31 kg. The de Broglie wavelength of an electron whose speed is 10⁸ m/s is

If Planck's constant were smaller than it is,

The energy difference between adjacent energy levels in a hydrogen atom

An increase in the voltage applied to an X-ray tube causes an increase in the X-rays'

In an emission spectral series, the

In order to increase the rate at which photoelectrons are emitted by a surface on which light is directed, it is necessary to increase the

According to the uncertainty principle, it is impossible to precisely determine

Electrons

The Scientific Method

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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

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Exam 9: The Atom

The speed of a photon

The photoelectric effect occurs only when the incident light has more than a certain minimum

The wavelengths in the various spectral series of an element

The orbital of an electron in an atom is

A p orbital

The quantum number n of the lowest energy state of a hydrogen atom

A neon sign does not produce

Which of the following cannot be explained by the quantum theory of light?

A proton and an electron have the same de Broglie wavelength.

The number of values the spin magnetic quantum number ms of an atomic electron can have is

The sun's spectrum consists of a bright background crossed by dark lines. This suggests that the sun

A beam of light whose waves are all in step with one another is said to be

Planck's constant is h = 6.6 × 10-34 Js and the electron mass is 9.1 × 10-31 kg. The de Broglie wavelength of an electron whose speed is 108 m/s is

If Planck's constant were smaller than it is,

The energy difference between adjacent energy levels in a hydrogen atom

An increase in the voltage applied to an X-ray tube causes an increase in the X-rays'

In an emission spectral series, the

In order to increase the rate at which photoelectrons are emitted by a surface on which light is directed, it is necessary to increase the

According to the uncertainty principle, it is impossible to precisely determine

Electrons

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

The number of values the spin magnetic quantum number m_s of an atomic electron can have is

Planck's constant is h = 6.6 × 10^-34 Js and the electron mass is 9.1 × 10^-31 kg. The de Broglie wavelength of an electron whose speed is 10⁸ m/s is