1. Chapter 22

2. 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. Suppose the viewing screen in the figure is moved closer to the double slit. What happens to the interference fringes?

3. 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. Suppose the viewing screen in the figure is moved closer to the double slit. What happens to the interference fringes?

4. Light of wavelength 1 illuminates a double slit, and interference fringes are observed on a screen behind the slits. When the wavelength is changed to 2, the fringes get closer together. How large is 2 relative to 1 ? 1. 2 is larger than 1. 2. 2 is smaller than 1. 3. Cannot be determined from this information.

5. Light of wavelength 1 illuminates a double slit, and interference fringes are observed on a screen behind the slits. When the wavelength is changed to 2, the fringes get closer together. How large is 2 relative to 1 ? 1. 2 is larger than 1. 2. 2 is smaller than 1. 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 has been adjusted to produce a bright spot at the center of the interference pattern. Mirror M 1 is then moved distance toward the beam splitter while M 2 is moved distance 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 has been adjusted to produce a bright spot at the center of the interference pattern. Mirror M 1 is then moved distance toward the beam splitter while M 2 is moved distance 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. Young’s double slit experiment 2. Galileo’s observation of Jupiter’s moons 3. The Michelson-Morley interferometer 4. The Pound-Rebka experiment 5. Millikan’s oil drop experiment

12. What was the first experiment to show that light is a wave? 1. Young’s double slit experiment 2. Galileo’s observation of Jupiter’s moons 3. The Michelson-Morley interferometer 4. The Pound-Rebka experiment 5. Millikan’s 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.