# ch35 - Chapter 35 1 A"wave front is a surface of constant A...

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Chapter 35: INTERFERENCE 1. A “wave front” is a surface of constant: A. phase B. frequency C. wavelength D. amplitude E. speed ans: A 2. Huygens’ construction can be used only: A. for light B. for an electromagnetic wave C. if one of the media is vacuum (or air) D. for transverse waves E. for all of the above and other situations ans: E 3. Consider (I) the law of re fl ection and (II) the law of refraction. Huygens’ principle can be used to derive: A. only I B. only II C. both I and II D. neither I nor II E. the question is meaningless because Huygens’ principle is for wave fronts whereas both I and II concern rays ans: C 4. Units of “optical path length” are: 530 Chapter 35: INTERFERENCE

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5. The light waves represented by the three rays shown in the diagram all have the same frequency. 4 . 7 wavelengths fi t into layer 1, 3 . 2 wavelengths fi t into layer 2, and 5 . 3 wavelengths fi t into layer 3. Rank the layers according to the speeds of the waves, least to greatest. . . . . . . . . . . . . layer 3 . . . . . . . . . . . . layer 2 . . . . . . . . . . . . layer 1 6. Interference of light is evidence that: A. the speed of light is very large B. light is a transverse wave C. light is electromagnetic in character D. light is a wave phenomenon E. light does not obey conservation of energy ans: D 7. The reason there are two slits, rather than one, in a Young’s experiment is: 8. In a Young’s double-slit experiment the center of a bright fringe occurs wherever waves from the slits di ff er in the distance they travel by a multiple of: A. a fourth of a wavelength B. a half a wavelength C. a wavelength D. three-fourths of a wavelength E. none of the above ans: E Chapter 35: INTERFERENCE 531
9. In a Young’s double-slit experiment the center of a bright fringe occurs wherever waves from the slits di ff er in phase by a multiple of: 10. Waves from two slits are in phase at the slits and travel to a distant screen to produce the third side maximum of the interference pattern. The di ff erence in the distance traveled by the waves is:

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