Download Please look over the following review questions

Lesson 12
Quantum Mechanics
Please look over the following review questions and exercises. If you are unsure of the
answers, check your text and then the appendix that follows all the lessons in this
course for the information. Do not submit these to your instructor.
Review Questions
Chapter 31, pages 620–621, questions: 1, 2, 3, 6, 8, 11, 15, 16, 17, 18, 20; Chapter 32, pages
633–634, questions: 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 24.
Exercises
1.
The photoelectric effect best demonstrates
a.
b.
c.
d.
2.
In the photoelectric effect, the brighter the illuminating light on the surface, the
greater
a.
b.
c.
d.
3.
the number of ejected electrons
the velocity of ejected electrons
both of these
neither of these
A quantum of light is called a __________.
a.
b.
c.
d.
e.
4.
the wave nature of light
the particle nature of light
both of these
none of these
proton
neutron
electron
notron
none of these
In the double slit experiment with electrons, the pattern observed on the screen is
a.
b.
wave-like
particle-like
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c.
d.
neither of these
both of these
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Lesson 12
Quantum Mechanics
5.
Quantum uncertainties are most predominant for simultaneously measuring the
speed and location of __________.
a.
b.
c.
6.
The uncertainty principle applies not only to momentum and position, but to
energy and time.
a.
b.
7.
a baseball
a spitball
an electron
True
False
According to the uncertainty principle, the more we know about a particle’s
momentum, the less we know about its __________.
a.
b.
c.
d.
e.
kinetic energy
mass
speed
location
none of these
8.
to represent the energy
a.
b.
c.
d.
9.
Two photons have the same wavelength. They also have the same __________.
a.
b.
c.
d.
10.
of the emitted photon
difference between atomic energy states producing the photon
both of these
neither of these
frequency
energy
both of these
neither of these
An electron and a baseball move at the same speed. Which has the longer
wavelength?
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a.
b.
c.
the electron
the baseball
Both have the same wavelength.
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Lesson 12
Quantum Mechanics
11.
If a proton and an electron have identical momenta, the longer wavelength belongs
to the
a.
b.
c.
12.
According to the uncertainty principle, the more we know about a particle’s
position, the less we know about the particle’s
a.
b.
c.
d.
e.
13.
less kinetic energy than the absorbed photon’s energy
more kinetic energy than the absorbed photon’s energy
kinetic energy equal to the absorbed photon’s energy
The Schrödinger equation is restricted to
a.
b.
c.
16.
affects the velocity of the particle
has no affect on the velocity of the particle
In the photoelectric effect, electrons ejected from bound states in the photosensitive
material have
a.
b.
c.
15.
speed
momentum
kinetic energy
all of these
none of these
According to quantum physics, measuring the velocity of a tiny particle with an
electromagnet
a.
b.
14.
proton
electron
Both are the same.
submicroscopic particles
submicroscopic particles and microscopic particles
none of these
Which of the following forms an interference pattern when directed toward two
suitably spaced slits?
a.
b.
light
sound
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c.
d.
e.
electrons
all of these
none of these
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Lesson 12
Quantum Mechanics
17.
A beam of electrons has __________.
a.
b.
c.
d.
18.
Heavy atoms are not appreciably larger in size than light atoms because the nuclei
of heavy atoms have
a.
b.
c.
d.
e.
19.
theories of submicroscopic particles
theories of macroscopic particles
all good theories
A new theory conforms to the correspondence principle when it
a.
b.
c.
d.
e.
21.
more mass
more electric charge
more nucleons
all of these
none of these
The correspondence principle applies to
a.
b.
c.
20.
wave properties
particle properties
both of these
neither of these
corresponds to all theories in nature
updates the essence of the old theory
ties two or more theories together
accounts for verified results of the old theory
none of these
The quantum mechanical probability cloud for the electron in the hydrogen atom
has an average radius
a.
b.
quite different from the radius predicted by Bohr
that agrees with the orbital radius of Bohr
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22.
An excited atom decays to its ground state and emits a photon of green light. If
instead the atom decays to an intermediate state, then the light could be
a.
b.
c.
d.
e.
23.
The probability of finding a particle at a given point in space is
a.
b.
c.
d.
24.
everything is completely random.
there are certain limits on how accurately certain properties can be known.
the position and momentum of microscopic particles are unknown.
none of these
Complementary properties
a.
b.
c.
d.
26.
given by the frequency of the matter wave associated with the particle
the square of the amplitude of the matter wave associated with the particle
neither of these
both of these
The Uncertainty Principle states that
a.
b.
c.
d.
25.
red
violet
blue
any of these
none of these
are nice to each other
produce great color schemes
describe different aspects of an object
are the same
Young’s double slit experiment showed that
a.
b.
c.
d.
e.
electrons had wave-like properties.
photons had particle-like properties.
photons had wave-like properties.
None of these is correct.
All of these are correct.
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Lesson 12
Quantum Mechanics
27.
Nodes of de Broglie waves are
a.
b.
c.
d.
e.
positions of zero amplitude
positions of zero probability of finding particles associated with the de
Broglie wave
indicative of the overtone level of the wave
none of these
all of these
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