1. Chapter 24

2. They get brighter but otherwise do not change.
Suppose the viewing screen in the figure is moved closer to the double slit. What happens to the interference fringes?
STT22.1
They get brighter but otherwise do not change.
They get brighter and closer together.
They get brighter and farther apart.
They get out of focus.
They fade out and disappear.

3. They get brighter but otherwise do not change.
Suppose the viewing screen in the figure is moved closer to the double slit. What happens to the interference fringes?
STT22.1
They get brighter but otherwise do not change.
They get brighter and closer together.
They get brighter and farther apart.
They get out of focus.
They fade out and disappear.

4. Cannot be determined from this information.
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?
l2 is larger than l1.
l2 is smaller than l1.
Cannot be determined from this information.
STT22.2

5. Cannot be determined from this information.
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?
l2 is larger than l1.
l2 is smaller than l1.
Cannot be determined from this information.
STT22.2

6. the red side is on the right, the violet side on the left.
White light passes through a diffraction grating and forms rainbow patterns on a screen behind the grating. For each rainbow,
the red side is on the right, the violet side on the left.
the red side is on the left, the violet side on the right.
the red side is closest to the center of the screen, the violet side is farthest from the center.
the red side is farthest from the center of the screen, the violet side is closest to the center.
STT22.3

7. the red side is on the right, the violet side on the left.
White light passes through a diffraction grating and forms rainbow patterns on a screen behind the grating. For each rainbow,
the red side is on the right, the violet side on the left.
the red side is on the left, the violet side on the right.
the red side is closest to the center of the screen, the violet side is farthest from the center.
the red side is farthest from the center of the screen, the violet side is closest to the center.
STT22.3

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 2 3 4
STT22.5

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 2 3 4
STT22.5

10. What was the first experiment to show that light is a wave?
Young’s double slit experiment
Galileo’s observation of Jupiter’s moons
The Michelson-Morley interferometer
The Pound-Rebka experiment
Millikan’s oil drop experiment
IG22.1

11. What was the first experiment to show that light is a wave?
Young’s double slit experiment
Galileo’s observation of Jupiter’s moons
The Michelson-Morley interferometer
The Pound-Rebka experiment
Millikan’s oil drop experiment
IG22.1

12. What is a diffraction grating?
A device used to grate cheese and other materials
A musical instrument used to direct sound
A plaque with a tiny circular aperture
An opaque objects with many closely spaced slits
Diffraction gratings are not covered in Chapter 22.
IG22.2

13. What is a diffraction grating?
A device used to grate cheese and other materials
A musical instrument used to direct sound
A plaque with a tiny circular aperture
An opaque objects with many closely spaced slits
Diffraction gratings are not covered in Chapter 22.
IG22.2

14. two dim, closely spaced points of light. constructive interference.
When laser light shines on a screen after passing through two closely spaced slits, you see
a diffraction pattern.
interference fringes.
two dim, closely spaced points of light.
constructive interference.
IG22.3

15. two dim, closely spaced points of light. constructive interference.
When laser light shines on a screen after passing through two closely spaced slits, you see
a diffraction pattern.
interference fringes.
two dim, closely spaced points of light.
constructive interference.
IG22.3

16. The spreading of waves behind an aperture is
more for long wavelengths, less for short wavelengths.
less for long wavelengths, more for short wavelengths.
the same for long and short wavelengths.
not discussed in this chapter.
IG22.5

17. The spreading of waves behind an aperture is
more for long wavelengths, less for short wavelengths.
less for long wavelengths, more for short wavelengths.
the same for long and short wavelengths.
not discussed in this chapter.
IG22.5

18. Apertures for which diffraction is studied are
a single slit.
a circle.
a square.
both A and B.
both A and C.
IG22.6

19. Apertures for which diffraction is studied are
a single slit.
a circle.
a square.
both A and B.
both A and C.
IG22.6