Chapter 10

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Transcript Chapter 10

Chapter 31
Light Quanta
A quantum of light is called a
a.
b.
c.
d.
proton.
photon.
phonon.
None of the above.
A quantum of light is called a
a.
b.
c.
d.
proton.
photon.
phonon.
None of the above.
Which of these are quantized?
a.
b.
c.
d.
Electrons
Photons
Electric charge
All of these.
Which of these are quantized?
a.
b.
c.
d.
Electrons
Photons
Electric charge
All of these.
In the field of physics, a quantum
a.
b.
c.
d.
is a fundamental unit in nature.
is sometimes composed of subparts.
can vary with extreme conditions.
All of these.
In the field of physics, a quantum
a.
b.
c.
d.
is a fundamental unit in nature.
is sometimes composed of subparts.
can vary with extreme conditions.
All of these.
The ratio of a photon’s energy to its
frequency is
a.
b.
c.
d.
its speed.
its wavelength.
its amplitude.
Planck’s constant.
The ratio of a photon’s energy to its
frequency is
a.
b.
c.
d.
its speed.
its wavelength.
its amplitude.
Planck’s constant.
Planck’s constant h is
a. a proportionality constant similar to the more
familiar constant p.
b. the ratio of energy per frequency for a photon.
c. a basic constant of nature.
d. All of these.
Planck’s constant h is
a. a proportionality constant similar to the more
familiar constant p.
b. the ratio of energy per frequency for a photon.
c. a basic constant of nature.
d. All of these.
The photoelectric effect occurs when
light that hits a surface ejects
a.
b.
c.
d.
photons.
electrons.
Both of these.
None of these.
The photoelectric effect occurs when
light that hits a surface ejects
a.
b.
c.
d.
photons.
electrons.
Both of these.
None of these.
Comment: Don’t confuse the ejection of electrons
with the emission of photons.
During the photoelectric effect,
brighter light causes the emission of
a.
b.
c.
d.
more electrons.
more energetic electrons.
ultraviolet light.
a higher work function in the metal surface.
During the photoelectric effect,
brighter light causes the emission of
a.
b.
c.
d.
more electrons.
more energetic electrons.
ultraviolet light.
a higher work function in the metal surface.
The kinetic energy of electrons
ejected during the photoelectric effect
depends on the
a.
b.
c.
d.
brightness of illuminating light.
frequency of illuminating light.
speed of illuminating light.
sensitivity of the surface.
The kinetic energy of electrons
ejected during the photoelectric effect
depends on the
a.
b.
c.
d.
brightness of illuminating light.
frequency of illuminating light.
speed of illuminating light.
sensitivity of the surface.
The photoelectric effects supports the
view that light is composed of
a.
b.
c.
d.
waves.
particles.
Both of these.
None of these.
The photoelectric effects supports the
view that light is composed of
a.
b.
c.
d.
waves.
particles.
Both of these.
None of these.
Which of these best illustrates the
dual nature of light?
a.
b.
c.
d.
Light travels as a wave and hits like a particle.
Light travels as a particle and hits like a wave.
Both of these say much the same thing.
None of these.
Which of these best illustrates the
dual nature of light?
a.
b.
c.
d.
Light travels as a wave and hits like a particle.
Light travels as a particle and hits like a wave.
Both of these say much the same thing.
None of these.
The momentum of light is related to its
a.
b.
c.
d.
wavelength.
speed.
mass.
All of these.
The momentum of light is related to its
a.
b.
c.
d.
wavelength.
speed.
mass.
All of these.
The wavelength of a matter wave is
a.
b.
c.
d.
directly proportional to its momentum.
inversely proportional to its momentum.
theoretical only.
related to π.
The wavelength of a matter wave is
a.
b.
c.
d.
directly proportional to its momentum.
inversely proportional to its momentum.
theoretical only.
related to π.
The wavelength of an electron beam
is of practical use in
a.
b.
c.
d.
a centrifuge.
an electron microscope.
electron and optical microscopes alike.
powerful magnifying glasses.
The wavelength of an electron beam
is of practical use in
a.
b.
c.
d.
a centrifuge.
an electron microscope.
electron and optical microscopes alike.
powerful magnifying glasses.
The wavelengths of typical electron
beams are
a.
b.
c.
d.
longer than wavelengths of light.
shorter than wavelengths of light.
nonexistent.
practical in ultrasound technology.
The wavelengths of typical electron
beams are
a.
b.
c.
d.
longer than wavelengths of light.
shorter than wavelengths of light.
nonexistent.
practical in ultrasound technology.
Electron beams can undergo
a.
b.
c.
d.
diffraction.
interference.
Both of these.
None of these.
Electron beams can undergo
a.
b.
c.
d.
diffraction.
interference.
Both of these.
None of these.
Quantum uncertainties are relevant
when trying to simultaneously measure
the speed and location of
a.
b.
c.
d.
a baseball.
a spitball.
an electron.
All of these.
Quantum uncertainties are relevant
when trying to simultaneously measure
the speed and location of
a.
b.
c.
d.
a baseball.
a spitball.
an electron.
All of these.
According to the uncertainty principle,
the more we know about a particle’s
momentum, the less we know about its
a.
b.
c.
d.
kinetic energy.
mass.
location.
speed.
According to the uncertainty principle,
the more we know about a particle’s
momentum, the less we know about its
a.
b.
c.
d.
kinetic energy.
mass.
location.
speed.
Subatomic interactions described by
quantum mechanics are governed by
a.
b.
c.
d.
laws of certainty.
laws of probability.
exact measurements.
All of these.
Subatomic interactions described by
quantum mechanics are governed by
a.
b.
c.
d.
laws of certainty.
laws of probability.
exact measurements.
All of these.
In the quantum microworld,
predictability depends on
a.
b.
c.
d.
having exact measurements.
knowledge of initial conditions.
pure chance and luck.
chaos.
In the quantum microworld,
predictability depends on
a.
b.
c.
d.
having exact measurements.
knowledge of initial conditions.
pure chance and luck.
chaos.
A feature of chaotic systems is that
small changes in initial conditions
a.
b.
c.
d.
lead to small differences later.
lead to big differences later.
may lead to big differences later.
have little or no relation to small or big
differences later.
A feature of chaotic systems is that
small changes in initial conditions
a.
b.
c.
d.
lead to small differences later.
lead to big differences later.
may lead to big differences later.
have little or no relation to small or big
differences later.