Question 1

A throbbing pulse of electromagnetic radiation is called a

Accepted Answer

A)  photon. 
B)  proton. 
C)  lightron. 
D)  notron. 
E)  sparktron. 
A)  photon. 
B)  proton. 
C)  lightron. 
D)  notron. 
E)  sparktron.

Question 2

If light in a spectroscope were passed through a star-shaped opening instead of a thin slit, spectral lines would appear as

Accepted Answer

A)  blobs of no definite shape. 
B)  stars. 
C)  lines, but with poorer resolution. 
A)  blobs of no definite shape. 
B)  stars. 
C)  lines, but with poorer resolution.

Question 3

Which of the following photons has the greatest energy?

Accepted Answer

A)  infrared 
B)  ultraviolet 
C)  red light 
D)  green light 
E)  blue light 
A)  infrared 
B)  ultraviolet 
C)  red light 
D)  green light 
E)  blue light

Question 4

If light in a spectroscope passed through round holes instead of slits, spectral lines would appear

Accepted Answer

A)  round. 
B)  dimmer. 
C)  as thicker lines. 
A)  round. 
B)  dimmer. 
C)  as thicker lines.

Question 5

An excited atom is an atom

Accepted Answer

A)  with more protons than electrons. 
B)  that has one or more displaced electrons. 
C)  that has excess vibration. 
D)  that is frantic. 
A)  with more protons than electrons. 
B)  that has one or more displaced electrons. 
C)  that has excess vibration. 
D)  that is frantic.

Question 6

Which of the following continually emits electromagnetic radiation?

Accepted Answer

A)  insects 
B)  red-hot coals 
C)  radio antennas 
D)  all of these 
E)  none of these 
A)  insects 
B)  red-hot coals 
C)  radio antennas 
D)  all of these 
E)  none of these

Question 7

Compared to the energy put into a laser, the energy of the laser beam is

Accepted Answer

A)  the same. 
B)  more. 
C)  less. 
A)  the same. 
B)  more. 
C)  less.

Question 8

In the relationship E = hf for a photon emitted from an atom, the symbol E is used to represent the energy

Accepted Answer

A)  of the emitted photon. 
B)  difference between atomic energy states producing the photon. 
C)  both of these 
D)  neither of these 
A)  of the emitted photon. 
B)  difference between atomic energy states producing the photon. 
C)  both of these 
D)  neither of these

Question 9

We now consider the Bohr model of the atom to be

Accepted Answer

A)  totally useless - of historical interest only. 
B)  defective and oversimplified, but still useful. 
C)  an accurate picture of a hydrogen atom. 
A)  totally useless - of historical interest only. 
B)  defective and oversimplified, but still useful. 
C)  an accurate picture of a hydrogen atom.

Question 10

Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more

Accepted Answer

A)  nucleons. 
B)  mass. 
C)  electric charge. 
D)  all of these 
E)  none of these 
A)  nucleons. 
B)  mass. 
C)  electric charge. 
D)  all of these 
E)  none of these

Question 11

The ratio of the energy of a photon to its frequency is

Accepted Answer

A)  pi. 
B)  the photon's speed. 
C)  the photon's wavelength. 
D)  Planck's constant. 
E)  not known. 
A)  pi. 
B)  the photon's speed. 
C)  the photon's wavelength. 
D)  Planck's constant. 
E)  not known.

Question 12

The discreteness of energy levels is better understood by considering the electrons to be

Accepted Answer

A)  attached to the nucleus by massless springs. 
B)  like tiny planets orbiting a sun. 
C)  much less massive than the nucleus. 
D)  all of these 
E)  none of these 
A)  attached to the nucleus by massless springs. 
B)  like tiny planets orbiting a sun. 
C)  much less massive than the nucleus. 
D)  all of these 
E)  none of these

Question 13

To study the energy of photoelectrons we measure

Accepted Answer

A)  the time they take to go a given distance. 
B)  their temperature. 
C)  the distance they travel in a given time. 
D)  the potential difference required to stop them. 
A)  the time they take to go a given distance. 
B)  their temperature. 
C)  the distance they travel in a given time. 
D)  the potential difference required to stop them.

Question 14

When a clean surface of potassium metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following will also increase?

Accepted Answer

A)  the number of electrons ejected per second 
B)  the threshold frequency of the ejected electrons 
C)  the maximum kinetic energy of the ejected electrons 
D)  the time lag between the absorption of blue light and the start of emission of the electrons 
E)  none of these 
A)  the number of electrons ejected per second 
B)  the threshold frequency of the ejected electrons 
C)  the maximum kinetic energy of the ejected electrons 
D)  the time lag between the absorption of blue light and the start of emission of the electrons 
E)  none of these

Question 15

According to quantum physics, looking at a star through a telescope

Accepted Answer

A)  affects the processes occurring in the star. 
B)  has no effect on the processes occurring in the star. 
A)  affects the processes occurring in the star. 
B)  has no effect on the processes occurring in the star.

Question 16

The fact that iron absorption lines occur in the solar spectrum directly indicates that there is iron in the solar

Accepted Answer

A)  interior. 
B)  atmosphere. 
C)  surface. 
A)  interior. 
B)  atmosphere. 
C)  surface.

Question 17

To say that energy levels in an atom are discrete is to say the energy levels are well defined and

Accepted Answer

A)  separated from one another by the same energy increments. 
B)  private. 
C)  separate from one another. 
D)  continuous. 
A)  separated from one another by the same energy increments. 
B)  private. 
C)  separate from one another. 
D)  continuous.

Question 18

Compared to the average diameter of a hydrogen atom, the average diameter of a helium atom is

Accepted Answer

A)  smaller. 
B)  larger. 
C)  about the same. 
A)  smaller. 
B)  larger. 
C)  about the same.

Question 19

The quantum-mechanical probability cloud for the electron in the hydrogen atom has an average radius

Accepted Answer

A)  that agrees with the orbital radius of Bohr. 
B)  quite different from the radius predicted by Bohr. 
A)  that agrees with the orbital radius of Bohr. 
B)  quite different from the radius predicted by Bohr.

Question 20

If the energy levels in the neon atom were not discrete, neon signs would glow

Accepted Answer

A)  white. 
B)  blue. 
C)  red. 
A)  white. 
B)  blue. 
C)  red.

A throbbing pulse of electromagnetic radiation is called a

If light in a spectroscope were passed through a star-shaped opening instead of a thin slit, spectral lines would appear as

Which of the following photons has the greatest energy?

If light in a spectroscope passed through round holes instead of slits, spectral lines would appear

An excited atom is an atom

Which of the following continually emits electromagnetic radiation?

Compared to the energy put into a laser, the energy of the laser beam is

In the relationship E = hf for a photon emitted from an atom, the symbol E is used to represent the energy

We now consider the Bohr model of the atom to be

Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more

The ratio of the energy of a photon to its frequency is

The discreteness of energy levels is better understood by considering the electrons to be

To study the energy of photoelectrons we measure

When a clean surface of potassium metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following will also increase?

According to quantum physics, looking at a star through a telescope

The fact that iron absorption lines occur in the solar spectrum directly indicates that there is iron in the solar

To say that energy levels in an atom are discrete is to say the energy levels are well defined and

Compared to the average diameter of a hydrogen atom, the average diameter of a helium atom is

The quantum-mechanical probability cloud for the electron in the hydrogen atom has an average radius

If the energy levels in the neon atom were not discrete, neon signs would glow

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Exam 15: Quantum Theory

A throbbing pulse of electromagnetic radiation is called a

If light in a spectroscope were passed through a star-shaped opening instead of a thin slit, spectral lines would appear as

Which of the following photons has the greatest energy?

If light in a spectroscope passed through round holes instead of slits, spectral lines would appear

An excited atom is an atom

Which of the following continually emits electromagnetic radiation?

Compared to the energy put into a laser, the energy of the laser beam is

In the relationship E = hf for a photon emitted from an atom, the symbol E is used to represent the energy

We now consider the Bohr model of the atom to be

Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more

The ratio of the energy of a photon to its frequency is

The discreteness of energy levels is better understood by considering the electrons to be

To study the energy of photoelectrons we measure

When a clean surface of potassium metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following will also increase?

According to quantum physics, looking at a star through a telescope

The fact that iron absorption lines occur in the solar spectrum directly indicates that there is iron in the solar

To say that energy levels in an atom are discrete is to say the energy levels are well defined and

Compared to the average diameter of a hydrogen atom, the average diameter of a helium atom is

The quantum-mechanical probability cloud for the electron in the hydrogen atom has an average radius

If the energy levels in the neon atom were not discrete, neon signs would glow

About Science

Atoms

Equilibrium and Linear Motion

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Temperature, Heat, and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light Waves

Properties of Light

The Atomic Nucleus and Radioactivity

Physics of Rotation and Equilibrium

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