Ch40

1
Chapter 40
2
Three de Broglie waves are shown for particles of
equal mass. Rank in order, from largest to
smallest, the speeds of particles a, b, and c.
1. va vb gt vc 2. vb gt va gt vc 3. vb gt va
vc 4. vc gt va gt vb 5. vc gt va vb
3
Three de Broglie waves are shown for particles of
equal mass. Rank in order, from largest to
smallest, the speeds of particles a, b, and c.
1. va vb gt vc 2. vb gt va gt vc 3. vb gt va
vc 4. vc gt va gt vb 5. vc gt va vb
4
A particle in a rigid box in the n 2 stationary
state is most likely to be found
1. One-quarter of the way from either end. 2.
One-third of the way from either end. 3. In the
center of the box. 4. It is equally likely to be
found at any point in the box.
5
A particle in a rigid box in the n 2 stationary
state is most likely to be found
1. One-quarter of the way from either end. 2.
One-third of the way from either end. 3. In the
center of the box. 4. It is equally likely to be
found at any point in the box.
6
This is a wave function for a particle in a
finite quantum well. What is the particles
quantum number?
1. n 1 2. n 2 3. n 3 4. n 4 5. n
5
7
This is a wave function for a particle in a
finite quantum well. What is the particles
quantum number?
1. n 1 2. n 2 3. n 3 4. n 4 5. n
5
8
For which potential energy is this an appropriate
n 4 wave function?
(1) (2) (3) (4)
9
For which potential energy is this an appropriate
n 4 wave function?
(1) (2) (3)
(4)
10
Which probability density represents a quantum
harmonic oscillator with
1. a 2. b 3. c 4. d
11
Which probability density represents a quantum
harmonic oscillator with
1. a 2. b 3. c 4. d
12
A particle with energy E approaches an energy
barrier with height U0 gt E. If U0 is slowly
decreased, the probability that the particle
reflects from the barrier
1. Decreases. 2. Increases. 3. Does not change.
13
A particle with energy E approaches an energy
barrier with height U0 gt E. If U0 is slowly
decreased, the probability that the particle
reflects from the barrier
1. Decreases. 2. Increases. 3. Does not change.
14
Chapter 40 Reading Quiz
15
A quantum particle can pass through a region of
space that would be forbidden to a classical
particle. What is the name of this process?
1. Teleportation 2. Vacuum decay 3. Lasing 4.
Trapping 5. Tunneling
16
A quantum particle can pass through a region of
space that would be forbidden to a classical
particle. What is the name of this process?
1. Teleportation 2. Vacuum decay 3. Lasing 4.
Trapping 5. Tunneling
17
A particle in the ground state of a potential
energy well

• 1. is at rest.
• 2. has a zero-point motion.
• 3. is equally probable to be found at any point
  inside the well.
• 4. has a wave function that is zero at all
  points.
• 5. has zero energy.

18
A particle in the ground state of a potential
energy well

• 1. is at rest.
• 2. has a zero-point motion.
• 3. is equally probable to be found at any point
  inside the well.
• 4. has a wave function that is zero at all
  points.
• 5. has zero energy.

19
Which of these was not analyzed in this chapter?
1. A particle in a capacitor 2. A particle in a
finite potential well 3. A neutron in a
nucleus 4. An electron in an atom 5. An electron
in a quantum-well device
20
Which of these was not analyzed in this chapter?
1. A particle in a capacitor 2. A particle in a
finite potential well 3. A neutron in a
nucleus 4. An electron in an atom 5. An electron
in a quantum-well device