Ch22

1
Chapter 22
2
Suppose the viewing screen in the figure is moved
closer to the double slit. What happens to the
interference fringes?
1. They get brighter but otherwise do not
change. 2. They get brighter and closer
together. 3. They get brighter and farther
apart. 4. They get out of focus. 5. They fade out
and disappear.
3
Suppose the viewing screen in the figure is moved
closer to the double slit. What happens to the
interference fringes?
1. They get brighter but otherwise do not
change. 2. They get brighter and closer
together. 3. They get brighter and farther
apart. 4. They get out of focus. 5. They fade out
and disappear.
4
Light of wavelength l1 illuminates a double slit,
and interference fringes are observed on a screen
behind the slits. When the wavelength is changed
to l2, the fringes get closer together. How large
is l2 relative to l1?
1. l2 is larger than l1. 2. l2 is smaller than
l1. 3. Cannot be determined from this information.
5
Light of wavelength l1 illuminates a double slit,
and interference fringes are observed on a screen
behind the slits. When the wavelength is changed
to l2, the fringes get closer together. How large
is l2 relative to l1?
1. l2 is larger than l1. 2. l2 is smaller than
l1. 3. Cannot be determined from this information.
6
White light passes through a diffraction grating
and forms rainbow patterns on a screen behind the
grating. For each rainbow,
1. the red side is on the right, the violet side
on the left. 2. the red side is on the left, the
violet side on the right. 3. the red side is
closest to the center of the screen, the violet
side is farthest from the center. 4. the red side
is farthest from the center of the screen, the
violet side is closest to the center.
7
White light passes through a diffraction grating
and forms rainbow patterns on a screen behind the
grating. For each rainbow,
1. the red side is on the right, the violet side
on the left. 2. the red side is on the left, the
violet side on the right. 3. the red side is
closest to the center of the screen, the violet
side is farthest from the center. 4. the red side
is farthest from the center of the screen, the
violet side is closest to the center.
8
A Michelson interferometer using light of
wavelength l has been adjusted to produce a
bright spot at the center of the interference
pattern. Mirror M1 is then moved distance l
toward the beam splitter while M2 is moved
distance l away from the beam splitter. How many
bright-dark-bright fringe shifts are seen?
1. 0 2. 1 3. 2 4. 3 5. 4
9
A Michelson interferometer using light of
wavelength l has been adjusted to produce a
bright spot at the center of the interference
pattern. Mirror M1 is then moved distance l
toward the beam splitter while M2 is moved
distance l away from the beam splitter. How many
bright-dark-bright fringe shifts are seen?
1. 0 2. 1 3. 2 4. 3 5. 4
10
Chapter 22 Reading Quiz
11
What was the first experiment to show that light
is a wave?
1. Youngs double slit experiment 2. Galileos
observation of Jupiters moons 3. The
Michelson-Morley interferometer 4. The
Pound-Rebka experiment 5. Millikans oil drop
experiment
12
What was the first experiment to show that light
is a wave?
1. Youngs double slit experiment 2. Galileos
observation of Jupiters moons 3. The
Michelson-Morley interferometer 4. The
Pound-Rebka experiment 5. Millikans oil drop
experiment
13
What is a diffraction grating?
1. A device used to grate cheese and other
materials 2. A musical instrument used to direct
sound 3. A plaque with a tiny circular
aperture 4. An opaque objects with many closely
spaced slits 5. Diffraction gratings are not
covered in Chapter 22.
14
What is a diffraction grating?
1. A device used to grate cheese and other
materials 2. A musical instrument used to direct
sound 3. A plaque with a tiny circular
aperture 4. An opaque objects with many closely
spaced slits 5. Diffraction gratings are not
covered in Chapter 22.
15
When laser light shines on a screen after passing
through two closely spaced slits, you see
1. a diffraction pattern. 2. interference
fringes. 3. two dim, closely spaced points of
light. 4. constructive interference.
16
When laser light shines on a screen after passing
through two closely spaced slits, you see
1. a diffraction pattern. 2. interference
fringes. 3. two dim, closely spaced points of
light. 4. constructive interference.
17
This chapter discussed the
1. acoustical interferometer. 2. Michelson
interferometer. 3. Fabry-Perot
interferometer. 4. Both 1 and 2. 5. Both 2 and 3.
18
This chapter discussed the
1. acoustical interferometer. 2. Michelson
interferometer. 3. Fabry-Perot
interferometer. 4. Both 1 and 2. 5. Both 2 and 3.
19
The spreading of waves behind an aperture is

• 1. more for long wavelengths, less for short
  wavelengths.
• 2. less for long wavelengths, more for short
  wavelengths.
• 3. the same for long and short wavelengths.
• 4. not discussed in this chapter.

20
The spreading of waves behind an aperture is

• 1. more for long wavelengths, less for short
  wavelengths.
• 2. less for long wavelengths, more for short
  wavelengths.
• 3. the same for long and short wavelengths.
• 4. not discussed in this chapter.

21
Apertures for which diffraction is studied in
this chapter are
1. a single slit. 2. a circle. 3. a square. 4.
both 1 and 2. 5. both 1 and 3.
22
Apertures for which diffraction is studied in
this chapter are
1. a single slit. 2. a circle. 3. a square. 4.
both 1 and 2. 5. both 1 and 3.