Question 1

Light behaves primarily as a particle when it

Accepted Answer

A) travels from one place to another. 
B) interacts with matter. 
C) both of these 
D) neither of these 
A) travels from one place to another. 
B) interacts with matter. 
C) both of these 
D) neither of these

Question 2

The first to be credited with the idea that light is quantized was

Accepted Answer

A) Max Planck. 
B) Albert Einstein. 
C) both Planck and Einstein at about the same time. 
A) Max Planck. 
B) Albert Einstein. 
C) both Planck and Einstein at about the same time.

Question 3

Which of the following is quantized?

Accepted Answer

A) energy 
B) radiation 
C) number of atoms in a gold bar 
D) electric charge 
E) all of the above 
A) energy 
B) radiation 
C) number of atoms in a gold bar 
D) electric charge 
E) all of the above

Question 4

According to Heisenberg's uncertainty principle, the more we know about a particle's momentum, the less we know about its

Accepted Answer

A) kinetic energy. 
B) mass. 
C) speed. 
D) location. 
E) none of the above 
A) kinetic energy. 
B) mass. 
C) speed. 
D) location. 
E) none of the above

Question 5

According to Louis de Broglie, a material particle has

Accepted Answer

A) particle properties. 
B) wave properties. 
C) both of these 
D) neither of these 
A) particle properties. 
B) wave properties. 
C) both of these 
D) neither of these

Question 6

The photons having least energy are those of

Accepted Answer

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

Question 7

An electron and a baseball move at the same speed. Which has the longer wavelength?

Accepted Answer

A) the electron 
B) the baseball 
C) both the same 
D) none of the above 
A) the electron 
B) the baseball 
C) both the same 
D) none of the above

Question 8

Casually sneaking a quick peek at a photo in your mobile phone

Accepted Answer

A) adds energy to the photo. 
B) subtracts energy from the photo. 
C) brings you into an observer-observed relationship that intrigues some science types. 
D) changes the phone itself 
E) none of the above 
A) adds energy to the photo. 
B) subtracts energy from the photo. 
C) brings you into an observer-observed relationship that intrigues some science types. 
D) changes the phone itself 
E) none of the above

Question 9

Very low-intensity light passing through a double slit produces a pattern that

Accepted Answer

A) is built up one photon at a time. 
B) reveals which slit each photon passed through. 
C) changes only in intensity as time passes, not in detailed structure. 
A) is built up one photon at a time. 
B) reveals which slit each photon passed through. 
C) changes only in intensity as time passes, not in detailed structure.

Question 10

To study the energy of photoelectrons we measure

Accepted Answer

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

Question 11

If we increase the brightness of violet light shining on a photosensitive surface we also increases the

Accepted Answer

A) number of electrons ejected per second. 
B) kinetic energy of the ejected electrons. 
C) threshold frequency. 
D) time lag between the absorption of blue light and ejection of electrons. 
E) none of the above 
A) number of electrons ejected per second. 
B) kinetic energy of the ejected electrons. 
C) threshold frequency. 
D) time lag between the absorption of blue light and ejection of electrons. 
E) none of the above

Question 12

In the equation E = hf, the symbol f stands for

Accepted Answer

A) wave frequency. 
B) wavelength. 
C) rate at which photons are emitted. 
D) none of the above 
A) wave frequency. 
B) wavelength. 
C) rate at which photons are emitted. 
D) none of the above

Question 13

Which can undergo diffraction?

Accepted Answer

A) photons. 
B) electrons. 
C) positrons. 
D) all of the above 
E) none of the above 
A) photons. 
B) electrons. 
C) positrons. 
D) all of the above 
E) none of the above

Question 14

Heisenberg's uncertainty principle is

Accepted Answer

A) noticeable only for submicroscopic particles. 
B) a fundamental principle in quantum mechanics. 
C) predominant in the atomic domain. 
D) all of the above 
E) none of the above 
A) noticeable only for submicroscopic particles. 
B) a fundamental principle in quantum mechanics. 
C) predominant in the atomic domain. 
D) all of the above 
E) none of the above

Question 15

According to the principle of complementarity, wavelike and particle-like properties of light

Accepted Answer

A) only slightly contradict each other. 
B) very much contradict each other. 
C) make up a wholeness that better describes nature. 
D) none of the above 
A) only slightly contradict each other. 
B) very much contradict each other. 
C) make up a wholeness that better describes nature. 
D) none of the above

Question 16

What is conserved when a photon collides with an electron?

Accepted Answer

A) momentum 
B) energy 
C) both of these 
D) neither of these 
A) momentum 
B) energy 
C) both of these 
D) neither of these

Question 17

The wavelength of a particle relates to its

Accepted Answer

A) momentum. 
B) energy levels. 
C) quantum number. 
D) all of the above 
E) none of the above 
A) momentum. 
B) energy levels. 
C) quantum number. 
D) all of the above 
E) none of the above

Question 18

In casually observing a cup of tea you are

Accepted Answer

A) affecting its temperature. 
B) affecting its location. 
C) both of these 
D) neither of these 
A) affecting its temperature. 
B) affecting its location. 
C) both of these 
D) neither of these

Question 19

When Niels Bohr was knighted for his contributions to physics, he chose for his coat of arms

Accepted Answer

A) a model of the planetary atom. 
B) a rendition of an energy-level diagram. 
C) the yin-yang symbol of Eastern culture. 
D) none of the above 
A) a model of the planetary atom. 
B) a rendition of an energy-level diagram. 
C) the yin-yang symbol of Eastern culture. 
D) none of the above

Question 20

Hypothetically, if Planck's constant were smaller, atoms would be

Accepted Answer

A) larger. 
B) smaller. 
C) no different in physical size. 
A) larger. 
B) smaller. 
C) no different in physical size.

Exam 31: Light Quanta

Light behaves primarily as a particle when it

The first to be credited with the idea that light is quantized was

Which of the following is quantized?

According to Heisenberg's uncertainty principle, the more we know about a particle's momentum, the less we know about its

According to Louis de Broglie, a material particle has

The photons having least energy are those of

An electron and a baseball move at the same speed. Which has the longer wavelength?

Casually sneaking a quick peek at a photo in your mobile phone

Very low-intensity light passing through a double slit produces a pattern that

To study the energy of photoelectrons we measure

If we increase the brightness of violet light shining on a photosensitive surface we also increases the

In the equation E = hf, the symbol f stands for

Which can undergo diffraction?

Heisenberg's uncertainty principle is

According to the principle of complementarity, wavelike and particle-like properties of light

What is conserved when a photon collides with an electron?

The wavelength of a particle relates to its

In casually observing a cup of tea you are

When Niels Bohr was knighted for his contributions to physics, he chose for his coat of arms

Hypothetically, if Planck's constant were smaller, atoms would be

About Science

Newtons First Law of Motion: Inertia

Linear Motion

Newtons Second Law of Motion

Newtons Third Law of Motion: Action and Reaction

Momentum

Energy

Rotational Motion

Gravity

Projectile and Satellite Motion

Atomic Nature of Matter

Solids

Liquids

Gases and Plasmas

Temperature, Heat, and Expansion

Heat Transfer

Change of Phase

Thermodynamics

Vibrations and Waves

Sound

Musical Sounds

Electrostatics

Electric Current

Magnetism

Electromagnetic Induction

Properties of Light

Color

Reflection and Refraction

Light Waves

Light Emission

The Atom and the Quantum

Atomic Nucleus and Radioactivity

Nuclear Fission and Fusion

Special Theory of Relativity

General Theory of Relativity

Systems of Measurement

Filters